An exit poll has predicted a Labour majority in the general election, with Wycombe's Steve Baker among those at risk of losing their seat.
The exit poll suggests Labour is on course for 410 seats, with the Tories reduced to 131.
It will mean a Labour prime minister in No 10 for the first time in 2010 and the Conservatives facing a possible civil war as the fight for the future direction of the party and the battle to potentially replace Mr Sunak gets under way.
The likes of Penny Mordaunt, Grant Shapps, Suella Braverman, Steve Baker and Robert Jenrick all face battles to return to Parliament.
Former home secretaries Suella Braverman and Dame Priti Patel, security minister Tom Tugendhat and Health Secretary Victoria Atkins could survive to fight for the leadership.
The exit poll suggested Labour would have a majority of 170, with the forecast indicating the lowest number of Tory MPs on record.
The poll suggested the Liberal Democrats will win 61 seats, Reform UK on 13 and the Green Party two.
In Scotland, the SNP are expected to secure 10 seats with Plaid Cymru in Wales on four.
Mr Baker, who had indicated he would run for the leadership if he survived, said it was a “pretty devastating night for the Conservative Party”.
He told the BBC he expected Mr Sunak will now “do what he believes is in the national interest”.
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