MPs have warned plans to ban British jihadis returning to the UK from the Middle East would breach their human rights.
The concerns come just a week after terrorist attacks in Paris by Islamic extremists left 17 people dead.
A cross-party Joint Committee on Human Rights said the tough measure should be axed from beefed-up anti-terror laws.
Publishing a report into a raft of new powers contained in the Counter Terrorism and Security Bill, MPs called for tight controls over powers to seize passports of young Brits who it is feared may wage jihad abroad.
It said there was “a very real risk that the human rights of UK nationals, including the right to return to one’s country of nationality, will be violated as a result of their imposition”.
Chairman Hywel Francis admitted: “Recent events in Paris make clear the challenging times in which we live and the need for Government to carry out their function of fighting terrorism and assuring the security of their people.
“We are satisfied that in some areas there are gaps in the Government’s counter terrorism powers but some of the powers proposed in this Bill require extra safeguards.”
The committee also objected to plans that universities should be under a duty to crack down on extremism, on the basis the move might restrict academic debate and freedom of speech.
But the group ”reluctantly” agreed suspects subject to Terrorism Prevention and Investigation Measures (T-pims) could be moved out of areas where they risk associating with other would-be terrorists.