Three of the four women who accused former Lib Dem chief executive Lord Rennard of harassment have called for the peer to be "kicked out" of the party.
Bridget Harris, a Lib Dem activist, has welcomed Lord Rennard's apology, but said his position within the Liberal Democrats was untenable.
"The real question here is, 'Should the Lib Dems accept him back on the benches in the House of Lords?' And I don't think the answer to that is yes", Ms Harris told BBC News.
Another activist who made the claims, Susan Gaszczak, said, "We really have got to draw a line under this. The only way to do that is actually to say, 'Lord Rennard, it's time to go.'"
A third woman, former Welsh Assembly candidate Alison Goldsworthy, told Channel 4 News the apology was a start, but stressed she thought Lord Rennard should be expelled from the Lib Dems.
More top news
David Cameron has described the Institute of Fiscal Studies as a 'gold standard' group of experts, as it warned of 'Brexit' dangers.
Eric Cantona. The King of Manchester. Picture it now, a dead pigeon on his head with its blood pouring down his face.
The number of antibiotics being prescribed by GPs in England has fallen by 2.6 million.