The senior Liberal Democrat peer Lord Rennard has been interviewed by police under caution over allegations he sexually harassed women party activists.
A Scotland Yard spokesman said a 52-year-old man had voluntarily attended a south London police station by appointment.
His solicitors said in a statement: "We can confirm that Lord Rennard agreed to meet with the police and that he welcomed his first opportunity to refute the basis of allegations made against him.
"We do not intend to make any further statement until the conclusion of the police inquiry."
Deputy Prime Minister Nick Clegg and two other Lib Dem ministers - Danny Alexander and Jo Swinson - were last week sharply criticised in a review into the party's handling of the complaints made against Lord Rennard when he was the Lib Dem chief executive.
Businesswoman Helena Morrissey, who conducted the inquiry, said that there should have been a formal investigation launched when his alleged victims first came forward.
In February it emerged that a number of woman activists and party workers had made allegations of unwanted advances, but when they reported the claims little action was taken.