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Six ministerial aides - the lowest rung of government - have been replaced by No 10, after they either quit or called for Sir Keir to set out a timetable for his replacement.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 resign or set out a timetable for resignation had reached 72 by the early hours of Tuesday.
The cabinet will formally meet first thing this morning.
