European courts put Britain at risk from terrorists, David Cameron warns "We do have a real problem when it comes to foreign nationals who threaten our security," Mr Cameron told the assembly. The problem today is that you can end up with someone who has no right to live in your country, who you are convinced - and have good reason to be convinced - means to do your country harm. And yet there are circumstances in which you cannot try them, you cannot detain them and you cannot deport them. So having put in place every possible safeguard to ensure that (human rights) are not violated, we still cannot fulfil our duty to our law-abiding citizens to protect them. Mr Cameron said Strasbourg must not be a "extra bite of the cherry for anyone dissatisfied with a domestic ruling." The court must also take pains not to become an "immigration tribunal" when national systems should be able to control their own borders, he warned. Britain is taking the opportunity to set out reforms of the Strasbourg court while it has the chair of the Council of Europe for six months until May. The 47 member countries have agreed in principle that final decisions should be made by national courts where possible, but details of reforms are yet to be agreed. Although there is consensus on the need for change, Mr Cameron faced hostility from some politicians questioning the UK's tendency to "keep saying no" to European authorities. Jean-Pierre Michel, a French parliamentarian, called on the Prime Minister to accept a ruling from the European Court of Human Rights that the UK must allow prisoners to vote. Mr Cameron said Britain had been "pretty prompt in complying with the court's rulings, even if it did have a "reputation for complaining" along the way. He was also tackled over Britain's decision to stay out of the new European treaty and its strong opposition to a tax on financial transactions. The Prime Minister said he could not support a measure that would cost jobs and received applause for urging Europe to take "steps that will allow us to have another great European century." Mr Cameron's comments came ahead of a key speech to business leaders at the World Economic Forum in Davos today. He will argue that Europe's lack of competitiveness in business has become "its Achilles" heel." "In the name of social protection, the EU has promoted unnecessary measures that impose burdens on businesses and governments, and can destroy jobs," he will say.