Labour will table a motion of no confidence in the Government in the House of Commons today as it seeks to oust Boris Johnson from No 10 immediately.
A Labour source said that the motion will be tabled today and it is likely a vote will then be held tomorrow.
It is up to the Government to agree to make time in the Commons for such a vote to take place but convention dictates that a request for a vote tabled by the official opposition should be granted.
The push for the vote comes after the timetable for the Tory leadership contest was published last night which confirmed that Boris Johnson will stay in No 10 as a caretaker PM until September 5 when his successor is due to be announced.
Labour is adamant that Mr Johnson should leave No 10 immediately after he resigned as Tory leader last week. If the Government loses the vote it could trigger a general election.
However, the chances of Labour's bid succeeding are extremely slim, with Conservative MPs expected to vote to prop up the Government to allow the the Tory leadership contest to take place.
Follow the latest updates below.
Why is Labour calling a vote if it is likely to lose?
Labour will not be expecting to win the vote of no confidence in the Government.
It is tabling the vote for political purposes. It wants to force Tory MPs to vote in favour of keeping Boris Johnson in No 10 until the start of September when his successor will be announced.
Many Tory MPs agree with Labour that Mr Johnson should have left No 10 immediately and handed over to an interim PM.
But they will now have to vote for him to stay in order to prop up the Government and avoid a chaotic general election.
Labour views Mr Johnson as damaged goods electorally and the party will be keen to highlight that Tory MPs backed the PM even after he resigned. It is what is known in Westminster as election leaflet material.
What are the chances of the vote of no confidence succeeding?
Tory MPs will not vote to collapse the Government for two main reasons. Firstly, there is a Tory leadership contest in full swing and they would not want to face an election without a leader.
Secondly, the Conservative Party won the 2019 general election by a handsome margin and it is still two years or so until the next scheduled general election is due to take place.
Tory MPs will argue that the party still has a mandate to govern so why would they agree to an early election (especially given that Labour is currently ahead in the opinion polls).
Losing a vote of no confidence would not necessarily trigger a general election: The Government would be expected to resign but given the Tory majority in the Commons the party would have the right to try to form a new administration.
However, rapidly choosing a candidate to lead and form that administration amid a leadership contest would be extremely difficult, if not impossible.
What will happen if the Government loses the no confidence vote?
As the official Opposition, Labour can table a motion of no confidence in the Government in the House of Commons pretty much whenever it wants.
Convention dictates that if the Opposition asks for a vote then the Government should make time for it within days.
A motion of no confidence is a serious matter: A government that loses such a vote is expected to either resign or go to the country in a general election.
The last successful confidence vote in Parliament forced James Callaghan from office in the 1979 Winter of Discontent, ushering in Margaret Thatcher’s 11-year premiership.
Labour to table no confidence vote in Government
Labour will table a vote of no confidence in the Government in the House of Commons today, a party source has said.
The vote is expected to take place on Wednesday.
It is up to the Government to make time in the Commons for such a vote but convention dictates that a request for a vote tabled by the official opposition should be granted.
The push for the vote comes after the Tory leadership contest timetable was announced last night, confirming that Boris Johnson will stay in No 10 until September 5.
What is the timetable for the Tory leadership contest?
Nominations for the Tory leadership will open at lunchtime and close at 6pm. Candidates will need the support of at least 20 MPs to make it onto the ballot.
The first round of voting will take place tomorrow between 1.30pm and 3.30pm, with the result announced at 5pm.
Any candidate who secures the backing of fewer than 30 MPs 3will be expected to withdraw from the contest.
The second round of voting will take place between 11.30am and 1.30pm on Thursday, with the result announced at 3pm. There will then be further votes as required next Monday, Tuesday and Wednesday - until there is a final two.
The candidate finishing in last place will be eliminated from the contest.
The final two candidates will then face a vote of Tory members with hustings taking place across the country from July 22.
The winner of the contest will then be announced on September 5.
Lord Frost warns against choosing Rishi Sunak as Tory leader
Lord Frost, the former Brexit minister, has appeared to warn Tory MPs against choosing Rishi Sunak as Boris Johnson's replacement.
Lord Frost said that the next Tory leader must be "properly committed to Brexit" and be somebody who will "take economic policy on a different path".
He told GB News late last night: “I may endorse somebody, who knows, in the next week or so. But I am looking for somebody who is properly committed to Brexit and… somebody who is going to take economic policy on a different path.
“We need tax cuts, we need fiscal support, we don’t need continuity Philip Hammond as the economic policy for the next few years. We need a better approach to Net Zero, it obviously can’t be done in the way that we are approaching it, that needs to change.”
Good morning and welcome to today's politics live blog.
The Tory leadership race will kick up a gear this morning as Rishi Sunak formally launches his campaign at an event in central London.
Tom Tugendhat and Kemi Badenoch are also scheduled to hold launch events.
Nominations will then open at lunchtime and close at 6pm which means in less than 12 hours we will know who has made it onto the formal ballot for the Tory leadership.
It promises to be a busy day of twists and turns and I will be here to guide you through the key developments.