Tim Farron has told ITV News Theresa May's pledge to change human rights legislation in the wake of recent terror attacks would be playing into the hands of terrorists.
Theresa May announced on Tuesday she would change human rights laws if they were stopping authorities tackling terrorism.
Asked about the prime ministers proposal, the Liberal Democrat leader said: "When all is said and done, changing the law is not what keeps us safe. Investing in our police and in our intelligence and security services - that Theresa May has cut - that is what would keep us safe.
"The danger is on the eve of an election, politicians will sometimes try and do something that looks good but we all know doesn't do us any good.
"And the minute we start throwing away our rights and our freedoms as a society is the moment we start to let the terrorists win."
You could argue this is 'the Ukip election' as the decisions of the party's former backers could largely shape the result.
'Labour's popularity seems to have increased very considerably indeed, despite proposing a full £49bn of tax rises.'
The politician is to stand in for Diane Abbott in one of the biggest roles in the shadow cabinet in the final day of election campaigning.