His dismissal is yet another setback for Truss following a dismal annual party conference in Birmingham this week, which descended into infighting and over her U-turn on a key policy. It will put renewed focus on the personal conduct of Tory MPs, which also undermined her predecessor Boris Johnson.

By firing Burns quickly, Truss will hope to avoid the fallout of the Chris Pincher affair, in which Johnson angered his backbenchers by not immediately dismissing Pincher over allegations of sexual assault.

“The prime minister took direct action on being informed of this allegation and is clear that all ministers should maintain the high standards of behavioor — as the public rightly expects,” the spokesperson said in the statement.

But Truss is still likely to face questions over her judgment in appointing Burns, who was previously a Northern Ireland minister trusted by John son with repairing relations with the US over Brexit. He has previously resigned from government in 2020, after he used his position as an MP to intimidate a member of the public.

The suspension of the whip from Burns reduces the Conservative Party’s working majority in the House of Commons to 69. Elected in 2010, Burns is the MP for Bournemouth West and has a majority of 10,150.

“In terms of politics as a whole it’s always worrying because we all expect and hope to maintain the highest standards in public life,” government minister Victoria Prentis told Times Radio in response to the complaint against Burns.