SNP Westminster leader Ian Blackford was ordered to leave the Commons during a furious debate on Boris Johnson and party gate.
Speaker Lindsay Hoyle made the decision after Blackford repeatedly refused to withdraw his claim that Johnson had misled the House.
It came after civil servant Sue Gray published a limited version of her report into Downing Street's lockdown parties.
Despite the restricted by a police probe, Gray criticised behaviour that she said was "difficult to justify" and which amounted to "serious" failures of leadership.
In the Commons, Johnson faced huge criticism from political opponents over the lockdown parties, including from Blackford.
Hoyle asked Blackford to confirm whether he had withdrawn claims that the Prime Minister had misled the House.
Blackford replied: “That the Prime Minister may have inadvertently misled the House.”
Sir Lindsay countered: “To help me help the House, you’ve withdrawn your earlier comment and replaced it with inadvertently?”
Blackford said: “It’s not my fault if the Prime Minister can’t be trusted to tell the truth.”
Amid raucous shouting from the Tory benches, the Speaker said: “Under the power given to me by standing order number 43 I order the honourable member to withdraw immediately from the House.”
Blackford walked out the chamber before the Speaker had finished, with Sir Lindsay noting: “It’s all right, we don’t need to bother.”
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