As it stands, only Penny Mordaunt has officially declared she is standing to be the next Tory Party leader and prime minister – with 21 Tory MPs publicly supporting her bid so far.
Rishi Sunak leads Tory MPs’ nominations to take over from Liz Truss, with 95 colleagues backing him by our count – although his supporters say he has already reached the 100 needed by 14:00 BST on Monday to get on the ballot.
Boris Johnson, who is currently flying back to the UK from a holiday in the Caribbean, told an ally he’s “up for” entering the race – and is second to his former chancellor with 45 MPs pledging support.
Our tally is based on MPs telling the BBC who they’re backing, or publicly declaring for a potential candidate.
Meanwhile, other names mentioned as potential runners are former leadership hopefuls Suella Braverman and Kemi Badenoch – but neither have much in the way of supporters, and time is of the essence.
Other big names that have ruled themselves out include Michael Gove, Ben Wallace and Jeremy Hunt.
It’s a fast-moving situation in Westminster, so stick with us for updates as soon as we get them.
Source: BBC