Harriet Harman has expressed "regret" over the links between a 1970s paedophile rights campaign and the civil rights organisation for which she worked.
The Labour deputy leader has vigorously defended her actions as the legal officer of the National Council for Civil Liberties (NCCL) in the face of what she says is a political smear campaign.
The body granted "affiliate" status to the Paedophile Information Exchange (PIE) and is said to have lobbied for loosening of laws.
Ms Harman said last night that she stood by her actions "all the way through" her time at the NCCL when PIE was "challenged" and "pushed aside".
She repeatedly sidestepped questions over whether it had been a mistake to allow PIE to be affiliated to the NCCL, telling BBC 2's Newsnight that anybody could join "simply by paying a fee".
The Daily Mail, which has run a series of stories related to the links, accused the shadow culture secretary of failing to answer the main charges it has levelled against her.
In a fresh statement this morning, a spokeswoman for Ms Harman said: "She regrets the existence of PIE and she regrets their involvement with NCCL before she joined, although it was immaterial to her work.
"She stands by the statement from yesterday and she is certainly not going to apologise to the Daily Mail."