Conservative Trade Minister Conor Burns has been sacked after a complaint about “serious misconduct” at the Tory party conference.
The MP has also had the whip suspended.
An incident was alleged to have taken place at a hotel bar in the Hyatt in Birmingham.
Mr Burns, 50, the member for Bournemouth West, said he will “fully co-operate with the investigation and looks forward to clearing his name”.
A No.10 spokesperson said:
“Following a complaint of serious misconduct, the Prime Minister has asked Conor Burns MP to leave the government with immediate effect.
“The Prime Minister took direct action on being informed of this allegation and is clear that all ministers should maintain the high standards of behaviour – as the public rightly expects.”
The Whips’ Office was contacted by a conference delegate who witnessed the alleged incident.
A Whips’ Office spokesman said:
“We have suspended the Whip pending investigation into allegations of inappropriate behaviour earlier this week.
“We take all such allegations extremely seriously.
“The Prime Minister has been clear that the highest standards in public life must be upheld.”
During conference, Birmingham’s posh bars and hotels are packed with ministers, MPs, lobbyists, and Tory activists.