Cabinet ministers – including the new chancellor Nadhim Zahawi – have sent the chief whip to Number 10 to tell Boris Johnson to resign, Sky News understands.

The delegation of senior politicians, which also includes Transport Secretary Grant Shapps and Welsh Secretary Simon Hart, have told Chris Heaton-Harris than the PM’s position is untenable and want him to deliver the news.

Sky’s political editor Beth Rigby has been told the whip is in the building, while deputy political editor Sam Coates understands he will deliver the “final ultimatum” to Mr Johnson, saying “you go or we do”.

Business Secretary Kwasi Kwarteng is understood to have echoed the message, as well as Northern Ireland Secretary Brandon Lewis.

Politics Hub: Cabinet ministers will ask PM to go