Some MPs expect a sizeable rebellion. But will it be enough to remove the PM?published at 13:36 British Summer Time 6 June 2022
Nick Eardley
Political correspondent
Tonight's vote is a secret ballot.
That matters, because rebels hope some Conservatives will do in private what they can't do in public. They hope members of the government will be among those who vote against the PM.
But how many MPs can they get on side? That's the key calculation they are making.
From those I've spoken to, there is some confidence the PM is facing a sizable rebellion later. Not necessarily enough to lose, but likely enough to show dozens of his MPs don't want him in the top job any more.
Take all numbers with a pinch of salt - including the ones you are about to read. But one well-placed Tory MP, who is making up their mind as we speak, suggested the number could be between 125 and 145.
Another source familiar with how these things work reckons it will be over 100 - and possibly by a fair margin.
Remember, the key number is 180 - that is the majority of Conservative MPs.
In all honesty, we won't know for sure until tonight. Some MPs will be making their minds up in the next few hours. But that's the talk around Parliament this afternoon.