Who will be the next prime minister - and how should they be chosen?

That's the question in Westminster after Keir Starmer announced he would be quitting as prime minister in an emotional Downing Street speech on Monday.

Andy Burnham, the former Greater Manchester mayor, quickly confirmed his candidacy - he's now eligible after being sworn in as Makerfield's new MP.

Just minutes after Burnham ruled himself in, Wes Streeting, previously viewed as his biggest rival, declared his support for Burnham.

"I hope everyone else will back Andy, too," Streeting said. But now there are murmurings of a possible challenge.

Former defence minister Al Carns has said he is weighing up whether to run, while Sir Keir Starmer's Chief Secretary to the Treasury, Darren Jones, has also not ruled out a challenge - though is unlikely to stand, BBC News understands.

If Burnham does run unchallenged in a so-called "coronation" run, he could become prime minister as early as 17 July - the day after nominations for a new leader close.

As we take in the fallout to Starmer's resignation, we'll fill you in on who both potential challengers are - while taking in all the latest lines from Westminster and beyond.

(Source: BBC)