PM stands by Morgan McSweeney and attempts to draw line under row in which leaks suggested Wes Streeting would launch a leadership challenge

Keir Starmer has attempted to draw a line under extraordinary briefings by his allies that No 10 feared Wes Streeting could launch a leadership coup, insisting he had been reassured it “didn’t come from Downing Street”.

The prime minister gathered his senior staff to stress that briefings against cabinet ministers were “unacceptable” after apologising to Streeting for what had happened on Wednesday.

However, his spokesperson said Starmer also accepted assurances that No 10 staff had not briefed against Streeting and that he stood by his chief of staff, Morgan McSweeney.

Since the furore over No 10’s fears about a leadership challenge from Streeting, first revealed by the Guardian on Tuesday, there had been calls from Labour MPs for McSweeney’s resignation.