A vote of no-confidence in the Prime Minister has been triggered after 48 letters were submitted to chairman of the 1922 Committee, Sir Graham Brady.
The vote is expected to take place between 6pm this evening, with an outcome expected at 9pm.
If more than half of Conservative MPs vote against Theresa May, a leadership election will take place.
It is believed that more than 48 no-confidence letters - the amount needed to trigger the vote - were been submitted by MPs.
- Read more: Crispin Blunt MP: ‘I submitted my no confidence letter twice’
- Read more: Theresa May would survive a no confidence vote, says Bill Cash MP
The move follows the Prime Minister's decision to delay a meaningful vote on her Brexit deal in the House of Commons this week, which angered many MPs.
European Research Group member, Jacob Rees-Mogg, has called for fellow Conservative MPs to vote against the Prime Minister, and announced today that she "must go",
Fellow Conservative, Steve Baker, claimed it was in the "national interest" that Ms May was no longer at the helm of the party.