Home Secretary Shabana Mahmood is among a number of cabinet ministers calling for Sir Keir Starmer to set out a timetable for his resignation, leading to splits at the top of government.
It is understood Mahmood is in the minority in the cabinet over whether Sir Keir should set out a timetable.
Six ministerial aides – the lowest rung of government – have been replaced by No 10, after they either quit or called for Sir Keir to set out a timetable for his replacement.
And the tally of Labour MPs calling for Sir Keir to stand down had topped 70 towards midnight on Monday.
The cabinet will formally meet first thing on Tuesday morning.
The list of ministerial aides who quit on Monday included Joe Morris, Parliamentary Private Secretary (PPS) to Health Secretary Wes Streeting, a potential leadership contender.
Morris said the prime minister “no longer has the trust or confidence of the public”.
Melanie Ward, PPS to Deputy Prime Minister David Lammy, Naushabah Khan, PPS to Cabinet Office Minister Darren Jones, and Tom Rutland, PPS to Environment Secretary Emma Reynolds, also resigned.
Another two joined calls for Sir Keir to set out a timetable for his departure: Gordon McKee, PPS to Pensions Secretary Pat McFadden, and Sally Jameson, PPS to Home Secretary Shabana Mahmood.
There are 72 MPs who have now publicly urged Sir Keir either to resign immediately or set out a timetable to stand down.
In a speech earlier, the PM insisted he would prove the “doubters” wrong and would not be quitting.
He admitted the government had made mistakes but said it he had “got the big political choices right”.
But pressure for him to go intensified through the day, building on calls for a timetable for his resignation from supporters of the Mayor of Greater Manchester, Andy Burnham.
Calls have also come from the right of the party, including those close to Streeting, for a swifter departure, which would exclude the chance of Burnham standing for the leadership.
Pressure has been mounting on Sir Keir after Labour lost almost 1,500 councillors in local elections across England, with a surge in support for Reform UK, and the Greens also eating into Labour’s support in London and other urban areas.
The party was also kicked out of power in Wales, where it had enjoyed political dominance for a century, and returned just 17 of the 129 seats in the Scottish Parliament, its worst ever result at a Holyrood election.
In a statement, Morris said Labour councillors and candidates had “ended up taking the blame for decisions that were not theirs”.
“Despite the prime minister’s best efforts, voters simply do not accept that he can lead the change they voted for,” the MP for Hexham said.
“It is in the best interests of the country and the party that the prime minister sets out a swift timetable to ensure that a new leader is in place to regain the confidence of the public and to ensure that the government can deliver on the commitments it has made.”
Rutland, the MP for East Worthing and Shoreham, said: “It is clear to me that the prime minister has lost authority not just within the Parliamentary Labour Party but across the country and that he will not be able to regain it.”
Khan, the MP for Gillingham and Rainham, said the PM had “lost the confidence of the public”.
“I did not enter politics to stand by while we fail. We need a clear change of direction now and no game playing,” she said.
“I am calling for new leadership, so that we can rebuild trust and deliver the better future that the British people voted for.”
A PPS, which is an unpaid role, is appointed by a minister to act as their assistant. (BBC)
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