Rishi Sunak is desperately trying to keep the exodus of disillusioned Tory MPs down to 25.
Former Cabinet minister Sajid Javid became the 13th Tory MP to throw in the towel when he announced on Friday he would be giving up his Bromsgrove, Worcestershire seat.
But one in five Conservative MPs are now reportedly considering quitting before the next election and the PM will have to water down his plans to stop them.