Liz Truss told Transport Minister Grant Shapps there was "no room at the inn" when she sacked him - because he hadn't supported her, the ex-minister said.
Mr Shapps was given his marching orders within hours of the under-fire PM taking office last month as she purged Rishi Sunak's backers.
Now as Ms Truss's leadership flounders, the influential Tory says her decision to only appoint allies has come back to bite her.