The Lib Dem women and equalities minister Jo Swinson has told ITV News she took the complaints about former chief executive Lord Rennard seriously.
She told political correspondent Libby Wiener: "I did take those issues seriously...This is an issue which is very sensitive, very important to the people that confined in me."
But she refused to answer whether the party's leadership knew about those complaints.
Two inquiries have been set up by the party to look at the specific allegations against Lord Rennard and the wider party processes.
Lord Rennard has strongly denied all the claims against him.
But it was clear from his reception that Vince remains immensely popular - the man many see as the only true Lib Dem voice in the Cabinet.
Nick Clegg admitted tonight that his party had let people down, by not properly investigating allegations of sexual harassment.