How can Starmer be toppled and who could take over?
What is the process for MPs in ousting the prime minister from No 10?
More than 80 MPs have called for Sir Keir Starmer to resign, with three ministers quitting their posts in protest at his leadership.
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Jess Phillips, Alex Davies-Jones and Miatta Fahnbulleh were all among those to have quit as the prime minister told his Cabinet on Tuesday that he would not be standing down.
Pressure is building on the PM after Labour lost more than 1,400 seats in last week's local elections, more than half of those it was defending, and lost 37 councils.
Some 80 MPs have now called for him to be challenged, most of these having followed a speech to members on Monday morning, where he made pledges and appealed for support as he looked to continue on as PM.
Each party has its own rules for how a leader can be ousted, and this would likely be a different scenario to how Boris Johnson and Liz Truss were forced out of the Conservative Party while in No 10.
Here is how Labour might look to oust Sir Keir as leader.
There are three main ways for Labour to force out a leader of the party.
Leadership challenge
An MP can submit a leadership challenge by telling Labour's national executive committee that they are seeking nominations for a tilt at the top role. Written nominations would need to be submitted to Labour general secretary Hollie Ridley.
They set out a timeline for when they would want to contest the leadership and would need to show the support of 20% of Labour MPs, which is currently a requirement of 81. The challenger would then be on a leadership ballot alongside the current leader, who does not require any nominations to be put forward.
Labour's new leader would be the winner of this vote, which is then open to members of the party.
The only other requirement is that the challenger is a sitting MP, which discounts the Greater Manchester Mayor Andy Burnham and Mayor of London Sadiq Khan.
In 2016, Owen Smith challenged Jeremy Corbyn but was defeated, winning only 38% of the vote.
A vote of no confidence
The leader of the opposition, Ms Badenoch, can orchestrate a vote of no confidence - which will require MPs to then cast their votes on the support of the prime minister.
This is an unusual measure and hasn't succeeded since 1979 when James Callaghan's minority government was toppled, leading to Margaret Thatcher winning the next general election. Ms Badenoch is unlikely to succeed this way as it seems very unlikely the majority of MPs would support a motion put forward by her.
The parliamentary Labour party can also hold a vote of no confidence among MPs, but there is no requirement for a leader to step down as a result of one. Mr Corbyn lost a vote of no confidence in his own leadership in 2016 but clung onto power.
Resignations
What toppled Liz Truss and Boris Johnson from power was a number of cabinet members and ministers quitting.
The rule of Mr Johnson was effectively made untenable when there were too few experienced Tory members to make it possible for him to continue governing.
What would the timeline be?
Labour MP Catherine West is seeking to rally her parliamentary party colleagues to call on Sir Keir to set a timetable to quit by September.
But it is up to the Labour Party’s National Executive Committee to set the timeline for a leadership election.
The last such contest was triggered by Jeremy Corbyn’s resignation in December 2019 and ended with Sir Keir declared the new leader in early April 2020.
In recent contests, members have been given around a month to vote.
Who could put themselves forward to replace Sir Keir Starmer?
There is no obvious successor to Sir Keir.
Speculation is rife around the ambitions of his former deputy Angela Rayner and Greater Manchester Mayor Andy Burnham – but the former is still awaiting the outcome of a review into her tax affairs and the latter is not currently an MP.
Health Secretary Wes Streeting is also widely viewed as a potential leadership contender.
