Two senior members of Parliament have voiced their concerns that the government's proposed expansion of existing anti-terrorism legislation may not be legal under international law.
Former Liberal Democrat leader Sir Menzies Campbell suggested the proposal to exclude UK nationals from Britain "might not be legal", not least because of obligations under international law.
Former Attorney General Dominic Grieve said he shared the concerns expressed about preventing British nationals from returning.
Not only does it offend principles of international law, it actually would offend basic principles of our own common law as well. I would recommend ... the best course must be to bring these individuals to justice.
The PM wants to confiscate passports. But in Cardiff they want to solve extremism at it's roots - they just can't get the help to do it.
David Cameron has unveiled a series of new measures to combat the threat of terrorism.
Rumours suggesting London's Tube network will be targeted in a terrorist attack on Monday are "completely untrue", police say.