Barack Obama is expected to urge British voters to remain in the EU after he lands in London today.

The US President is likely to argue that Britain has an increased strength from its membership of the bloc while suggesting Brexit could undermine the “special relationship”.

The speech, expected tomorrow, has been earmarked by Remain campaigners as a method of reaching those so far unconvinced by “Project Fear” interventions from the Government or Jeremy Corbyn’s “warts and all” endorsement of the EU.

This follows a strong week of campaigning from the pro-EU camp, bolstered by an ORB poll for The Telegraph this week which showed support to remain at 53 per cent, with 41 per cent support to leave.

Obama’s expected speech follows a series of other interventions against Brexit. The IMF said a Brexit vote poses an economic and political risk in it’s World Economic Outlook earlier this month – a verdict that supports many claims about Britain’s financial stability made by the Remain team.

Alastair Campbell, former spin doctor for Tony Blair, will use a speech today to argue Brexit would play into the hands of ISIS terrorists, saying it would suit the agenda of those who aimed to destabilise the UK – which could also include President Putin.

Former deputy Prime Minister Nick Clegg has followed Obama’s arguments and written in The Times that Brexit would diminish Britain’s global position.

These comments follow concern from UK politicians regarding global stability, with Parliament voting yesterday evening to categorise ISIS’s onslaught on Christians, Yazidis and other religious and ethnic minorities as genocide.