Sir Keir Starmer has been urged to submit a formal motion of no confidence in the Tory government.
Scottish National Party ( SNP ) Westminster leader Sir Ian Blackford said now was the time to end the disastrous reign of the Conservatives, and force a confidence vote in the government.
He wrote to the Labour leader that opposition parties couldn't "stand idly by as the Tories attempt to impose their third prime minister in the space of three months".
