Home Secretary Amber Rudd has suggested a General Election victory for Labour would increase the risk of future terror attacks.
In an interview on the BBC's Andrew Marr Show, Ms Rudd was asked about comments made in a Sunday newspaper where she said Jeremy Corbyn would be a "disaster" for Britain's security.
She said: "The evidence is that Jeremy Corbyn, Diane Abbott and John McDonnell all have a history of not supporting terrorist legislation."
"Jeremy Corbyn has in fact in 2011 boasted that he opposed all counter-terrorism legislation," the home secretary said, adding: "It does worry me."
Earlier, shadow home secretary, Abbott also spoke to Andrew Marr and defended voting against what she referred to as "counter-productive" anti-terror legislation.
When also asked about her views on the IRA in the 1980s, said: "It was 34 years ago, I had a rather splendid afro at the time. I don't have the same hairstyle, I don't have the same views."
In response to her Labour counterpart's comments, Rudd said: "What I would say to Diane Abbott is I have changed my hairstyle a few times in 34 years as well, but I have not changed my view about how we keep the British public safe."
Appearing on ITV's Peston On Sunday, the Labour leader also defended his previous voting record on anti-terror measures.
Mr Corbyn said he had opposed "executive control orders that are not subject to judicial oversight".
"I do support work with the police and our security services on intelligence-led actions," he insisted.