The Conservative leadership candidate Esther McVey told Nick Ferrari that the Prime Minister will need only Brexit supporters around them in order to push through a plan to leave the EU.
That will be bad news for senior Remainers in the Cabinet such as Philip Hammond, David Gauke and Rory Stewart.
Speaking to LBC, she said: "I believe at the moment we actually have to have a team that believes in Brexit.
"They have to, because this is the most difficult delivery that we've got to give - and we've got to give it by the 31st October.
"You need to have people who believe in Brexit to deliver this by the 31st October.
"It would be a Brexit-only Cabinet until the 31st October."