The family of ISIS bride Shamima Begum today vowed to take Home Secretary Sajid Javid to court to stop him taking away her British citizenship. The remorseless 19-year-old is in a Syrian refugee camp with her newborn son but Mr Javid has moved to ensure she will never allowed back into Britain after she fled to join Islamic State. The Home Office will argue that because Begum's mother was born in Bangladesh her daughter is entitled to dual citizenship meaning she would not be left stateless, which is illegal under international law. But Begum's family says she does not have a Bangladeshi passport and has never been there, making Mr Javid's decision illegal, they claim. The teenager, who fled Britain with friends aged 15 and married a Dutch jihadi, has been unapologetic about ISIS' crimes and said the Manchester Arena suicide bombing could be considered 'retaliation'. She also insists that the British public should be 'sympathetic' towards her and should be allowed back to London with her baby on human rights grounds. But last night Sajid Javid last night moved to block her return to Britain arguing that taking away her British citizenship is 'conducive to the public good' on terrorism grounds. ISIS bride Shamima Begum has had her citizenship revoked according to a letter from the Home Office to her family The letter obtained by ITV News asks Begum's family to inform her of the decision to revoke her citizenship and her right to appeal it Shamima is pictured walking through Gatwick Airport on February 17 2015 as she left the UK Begum's family solicitor Tasnime Akunjee said Shamima said last night was 'surprised' Mr Javid had come to his conclusion. How Britain can strip citizenship from its enemies - as long as they are not 'stateless' Shamima Begum, who fled the UK to join the Islamic State terror group in Syria aged 15, has been stripped of her British citizenship. Home Secretary Sajid Javid ordered the move against the 19-year-old Londoner who wants to return to the UK with her newly-born child as the so-called caliphate crumbles. International law forbids nations from making people stateless by revoking their only citizenship. Britain appears to believe that Ms Begum, who is of Bangladeshi heritage, holds dual citizenship. Under the 1981 British Nationality Act, any Briton can be deprived of their citizenship if it is 'conducive to the public good' - and they do not become stateless as a result. A 2017 government report on the issue said the Home Secretary has the power to 'deprive a person of British citizenship' if it would be 'conducive to the public good'. However, this only applies if the person would not be left stateless. If it is the case Ms Begum is a dual national, she could have her British citizenship stripped. Begum has the right to appeal the decision to the Special Immigration Appeals Commission (SIAC). The SIAC is independent of the Government and allows individuals to appeal against immigration decisions by the Home Office, such as deportations and the removal of citizenship. Those who are outside of the UK have 28 days to lodge an appeal from the time they receive their Home Office letter. Amendments were made to British national laws in 2014 which made it easier to strip dual nationals of their British citizenship. These measures were primarily aimed at terrorists who could potentially undermine UK security, for example those who fled to Syria to fight and were attempting to return home. There are two other instances when British citizenship can be removed, which are permissible even if the person would be rendered stateless. Deprivation of citizenship can be made if a person obtained their citizenship through registration or naturalisation and the Home Secretary is 'satisfied that this was obtained by fraud, false representation or the concealment of a material fact'. Secondly, when citizenship is obtained through naturalisation and the Home Secretary believes that removing it would be 'conducive to the public good' because the person acted in way which is 'seriously prejudicial to the vital interests of United Kingdom, any of the Islands, or any British overseas territory'. Advertisement He said the family will 'consider all legal avenues to challenge this decision' in response. The family, from Bethnal Green in east London, were notified via a letter saying Home Secretary Mr Javid had started the process that will see Begum permanently banned from the UK. The family are 'very disappointed' by Mr Javid's decision, according to statement by Mr Akunjee. The Home Office letter asks that they pass on the decision - including that she has a right to appeal it - to Begum, who left their home in 2015 when she ran away with two school friends to join ISIS. She is now stranded in a refugee camp in Syria as the so-called caliphate crumbles. 'Please find enclosed papers that relate to a decision taken by the Home Secretary, to deprive your daughter, Shamima Begum, of her British citizenship,' the letter reads. 'In light of the circumstances of your daughter, the notice of the Home Secretary's decision has been served of file today, and the order removing her British citizenship has subsequently been made.' Only last week Britain's MI6 chief said that UK nationals, even those who are members of terror organisations like ISIS, have a legal right to return home. Government guidance from 2017 states that the Home Secretary has the power to order the deprivation if it would be 'conducive to the public good', as long as they are not left without any citizenship. A Home Office spokesman said he could not discuss individual cases, but added: 'We don't leave people stateless.' Mr Javid on Monday told the House of Commons: 'The powers available to me include banning non-British people from this country and stripping dangerous dual nationals of their British citizenship.' Over 100 people have already been deprived in this way. What will happen to Begum's new born son, however, remains unclear. He was born before his mother was deprived of citizenship - meaning he is still legally British. And while theoretically he could also have his citizenship revoked, the government would need to show he himself posed a threat. Begum's first two children both died of unknown illnesses under ISIS. Liberal Democrat home affairs spokesman Sir Ed Davey accused Mr Javid of 'an abdication of responsibility' by 'palming off' Begum on to another country. 'The UK has more than enough terrorism laws to prosecute Shamima Begum here,' he said. Meanwhile Conservative chair of the Commons Education Committee, Robert Halfon, who had spoken out against allowing Begum to return, said in a tweet that Mr Javid had made 'absolutely the right decision'. The move comes after Begum returned to the public eye when she was found heavily pregnant living in a refugee camp in northern Syria. She gave birth to a boy over the weekend, having already lost two children, and made pleas for forgiveness and to be accepted back in the UK. Earlier on Tuesday, Metropolitan Police Commissioner Cressida Dick said the 19-year-old could expect to be 'spoken to' if she comes back to Britain. The initial police stance when Ms Begum left the UK in 2015 was that she may be treated as a victim of grooming, but the Scotland Yard chief said: 'We're a long way down the road since then.' She added: 'If she does, under whatever circumstances, arrive at our borders, somebody in her type of circumstances could expect, of course, to be spoken to and, if there is the appropriate necessity, to be potentially arrested and certainly investigated. 'If that results in sufficient evidence for a prosecution then it will result in sufficient evidence for a prosecution. 'The officers will deal with whatever they are confronted with.' Metropolitan Police Commissioner Cressida Dick previously said counter-terrorism police officers will 'deal with whatever they are confronted with' if Begum returns to the UK On Monday in an interview with the BBC Ms Begum compared the Manchester Arena bombing to military strikes on Isis strongholds, calling the terror attack 'retaliation'.<doc-sep>The family of Bethnal Green teenager Shamima Begum have urged the British government to give them custody of her unborn child while she faces the prospect of imprisonment for supporting Islamic State. The pregnant 19-year-old has said she fears her baby, due to be born anytime now, will be taken from her if she manages to return to Britain after leaving the country in 2015 to join the terror group in Syria. Now her family have said that if she were to face a custodial sentence for her support of a terrorist organisation they will step in to raise the child, rather than the taxpayer having to pick up the cost. Muhammad Rahman, 36, whose brother is married to Shamima’s elder sister Renu, told The Sunday Telegraph: “Her parents would want custody of the baby. They would want to look after their grandchild. “I don’t think people, feeling the way many do about what Shamima has done, would want the state to pick up the burden of looking after the child.”<doc-sep>"I understand why you don't want to be sympathetic because of everything IS did... and claiming it's all for the sake of Islam... it's really not," she said.<doc-sep>
London (CNN) British teenager Shamima Begum , who moved from London to Syria four years ago to join ISIS, has said she was "a bit shocked" to learn that the UK plans to strip her of her British citizenship to prevent her from returning home. Speaking from a refugee camp in Syria, the 19-year-old told CNN affiliate ITV that it was "kind of heartbreaking to read" a copy of the Home Office letter sent to her parents informing them of its decision. Begum, who gave birth over the weekend and is seeking a return to Britain, called the move "hard to swallow" and described it as "a bit unjust on me and my son." "My family made it sound like it would be a lot easier for me to come back to the UK," she said. ITV News reported Tuesday that Begum's mother had received a letter from the Home Office which said an order to remove her citizenship had been made. The letter asked Begum's family to make her aware of the decision and of her right to appeal. Debate over legality of UK move The decision has sparked a debate about the legality behind it. A spokesman for the Home Office told CNN that the Home Secretary can deprive someone of their British citizenship "where it would not render the individual stateless." Begum's family is of Bangladeshi origin, according to former chief superintendent for the Metropolitan Police, Dal Bab, who has been in contact with the family. However the Bangladesh foreign ministry said in a statement that Begum is not a Bangladeshi citizen, nor has she ever visited the country. "The Government of Bangladesh is deeply concerned that she has been erroneously identified as a holder of dual citizenship shared with Bangladesh alongside her birthplace, the United Kingdom," the statement said. "She is a British citizen by birth and has never applied for dual nationality with Bangladesh ... There is no question of her being allowed to enter into Bangladesh." Home Secretary Sajid Javid suggested to Parliament on Wednesday that children of jihadists who lose their citizenship could still be British. "Children should not suffer, so if a parent does lose their British citizenship, it does not affect the rights of their child," he said. Earlier this week, he said the UK had revoked citizenship from more than 100 people. Hashi Mohamed -- a lawyer who helped write a report into deprivation of nationality with the UK's previous reviewer of terrorism legislation, David Anderson -- told CNN that the attempt to revoke Begum's citizenship was an "unprecedented" reworking of British immigration law. Mohamed said Javid seemed to be relying on a section in the 2014 Immigration Act , which states that nationality can be revoked if there are "reasonable grounds for believing that the person is able, under the law of a country or territory outside the United Kingdom, to become a national of such a country or territory." Mohamed said Javid's move had opened a can of worms which risked creating a "two-tiered British nationality" which could mean that "if you were born in bred in the UK, but your parents were born somewhere else and had dual nationality -- then your nationality as somebody born and raised in the UK is at risk." Mohamed also noted that the decision appeared to run against the Home Office's 2018 counter-terrorism policy , which includes an illustrated example of what to do with women who have joined ISIS and children returning to the UK. "Following the mother's detention the British authorities are notified. DNA testing of the child is conducted to establish their entitlement to a British passport. Given that the mother has lived in Daesh-held territory, the Home Secretary and a judge approve the use of a Temporary Exclusion Order (TEO) to manage her return to the UK," the 2018 guidance said. On Wednesday, UK Prime Minister Theresa May said there was a "very clear set of criteria" on which the Home Secretary considers depriving British nationals of their citizenship, but declined to provide further insight into the government's rationale. Begum: 'Don't know why my case is different' Begum told ITV that she might explore a potential citizenship route through her Dutch husband, an ISIS fighter who surrendered to US-backed forces in Syria weeks ago. "Another option I might try with my family is my husband is from Holland and he has family in Holland," she told ITV. "Maybe I can ask for citizenship in Holland.