 He brought in new anti-terrorism measures, including detention without trial of suspect foreign nationals who could not be extradited or deported.It caused a backbench rebellion and provoked strong opposition in the House of Lords, and Blunkett made concessions over incitement to religious hatred (later carried through by his successor) and to introduce a "sunset clause".He authorised MI5 to start collecting bulk telephone communications data on which telephone numbers called each other and when, authorised under a little understood general power under the Telecommunications Act 1984 instead of the Regulation of Investigatory Powers Act 2000 which would have brought independent oversight and regulation.