Liberal Democrat MP Mike Hancock has quit the party whip while he contests allegations of sexual assault at the High Court.
Mr Hancock is being sued in a civil action by a "vulnerable" constituent, who accused him of sexual assault after she contacted him for help in a dispute with a neighbour.
A Liberal Democrat spokesman said: "Mike Hancock has chosen to resign the party whip while he defends himself against very serious allegations in a High Court civil action.
"Mike Hancock strenuously denies the allegations made in the civil case and intends to clear his name in court."
Mr Hancock was arrested by police over the allegations in 2010 but no action was taken as the Crown Prosecution Service said there was insufficient evidence for a prosecution.
More top news
Oxford Circus has been evacuated after armed police responded to reports of shots.
Coleen Rooney said she is trying to make her marriage to the footballer work as she addressed divorce rumours in a defiant Facebook post.
Women serving time at a prison in Rio de Janeiro have swapped their jail cells for the catwalk as they took part in a beauty pageant.