David Cameron has backed plans to give Ofcom stronger powers to prevent the broadcast of "extremist messages" despite concerns from one of his own cabinet ministers that this could amount to state censorship.

The prime minister appeared to support Theresa May, the home secretary, after the Guardian revealed a split in the cabinet over her counter-extremism measures.

Sajid Javid, who was then culture secretary and is now business secretary, wrote to May before the election saying the plan would move Ofcom from a regulator "into the role of a censor" and involve "a fundamental shift in the way UK broadcasting is regulated" from post-transmission to pre-transmission monitoring.

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