Tory MPs are jockeying for position in the race to succeed Boris Johnson after the prime minister quit as Tory leader following a dramatic cabinet mutiny.
Tom Tugendhat is the latest MP to enter the leadership battle, joining Attorney General Suella Braverman and Brexiteer Steve Baker who have shown interest.
Mr Johnson plans to stay on as PM until a replacement is found by the autumn.
Opposition parties and some Tories want him to leave now - but he has appointed a new cabinet line-up.
One newly appointed minister, Education Secretary James Cleverly, said there was no need to appoint a "caretaker" leader, as some Tories have suggested.
Sir Geoffrey Clifton-Brown, the treasurer of the 1922 Committee of backbench Tory MPs, said in an "ideal world" deputy PM Dominic Raab would take over for a few weeks but "that ship has sailed".
"We must we must now live with the fact that Boris Johnson will be prime minister until a successor can be voted on," Sir Geoffrey added.
A timetable for the Tory leadership race is due to be confirmed next week and the new prime minister is expected to be in position by September.
The Labour Party has threatened to try and unseat the PM immediately through a vote of no confidence, although this would need considerable support among Conservatives to succeed.
Labour's Deputy Leader Angela Rayner told the BBC "the fact he's trying to cling on for the next couple of months is completely unacceptable".
The chairman of the Commons foreign affairs committee Mr Tugendhat, launched his leadership bid by writing in the Daily Telegraph on Friday, promising tax cuts and "new energy and ideas" for government.
"I have served before - in the military, and now in Parliament. Now I hope to answer the call once again as prime minister," said the former soldier, who has been a prominent critic of Mr Johnson.
Attorney-General Ms Braverman has already confirmed she will stand, while former Brexit minister Mr Baker said he was "seriously" considering running after being asked by people to do so.
Sajid Javid, the former health secretary, and Transport Secretary Grant Shapps - who both revolted against Mr Johnson - are also considering putting their hats into the ring, the BBC has been told.
Others tipped to run include Foreign Secretary Liz Truss, former Chancellor Rishi Sunak, Defence Secretary Ben Wallace and ex-Foreign Secretary Jeremy Hunt.
More declarations are expected in the coming days - but some senior Tories have already said they will not be running, including former Levelling Up Secretary Michael Gove, Deputy Prime Minister Dominic Raab and former Health Secretary Matt Hancock.
It may not surprise you to discover that Westminster is a postcode which doesn't suffer a deficit of ambition.
The wannabes will fight a popularity contest among Tory MPs in the next few weeks, and should two of them be left at the end of that process, Conservative Party members will get the final say over the summer.
Somewhere between 100,000 and 200,000 people will be charged with selecting the next head of our government on our behalf.
It is a safe bet the next prime minister will be a very different character to Boris Johnson. Given the manner and motivations behind his toppling, being seen to ooze integrity and revere truth are qualities all the candidates will aspire to illustrate.
But beyond that there will be an intriguing debate about what it means to a Conservative in 2022.
When a new leader assumes office, the political landscape will instantly shift.
Nearly 60 Conservative MPs have quit government roles in recent days at both senior and junior levels, raising doubts about the government's ability to function.
Speaking to his newly appointed cabinet on Thursday, Mr Johnson promised he would not use his remaining time in No 10 to make "major changes of direction."
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