David Cameron and a right-leaning thinktank have warned the government to defend its flagship counter-extremism strategy from criticisms or risk enabling terrorism.

In a controversial report from Policy Exchange, the former prime minister has demanded a robust defence of the Prevent strategy.

The report claims that Prevent is being undermined by “Islamist campaigners and their allies” and names organisations including CAGE and the Muslim Council of Britain (MCB).

Its release comes after Priti Patel has indicated she wishes to overhaul the strategy in the wake of the murder of the Conservative MP Sir David Amess.