In a conference today, Nick Clegg is expected to undermine Home Secretary Theresa May's suggestion that Britain could pull out of the European Convention on Human Rights.
"She wants this option to remain on the table: no chance," he will say.
"As I said last weekend, it won't be on the Cabinet table as long as I'm sitting round it.
"That's why having Liberal Democrats in government, anchoring it in the centre ground and delivering for Scotland, is so important."
In a speech in front of Scottish Liberal Democrats in Dundee this afternoon, Nick Clegg is expected to say:
I know that the fact of going into coalition with the Conservatives has been particularly controversial in Scotland.
The legacy of Margaret Thatcher's Government lingers long in the memory.
People in Scotland know that the Conservatives cannot be trusted to deliver a fairer society.
Not on their own anyway.
With only one MP in Scotland, who honestly thinks that the Conservatives on their own will stand up for you?
Nick Clegg will accuse his Tory coalition partners of being unable to stand up for Scottish interests in a conference speech today.
Appearing before Scottish Lib Dems in Dundee, the UK Liberal Democrat leader will bring focus to the backlash his party suffered for agreeing to join the UK Government at the last general election.
During his speech this afternoon, Mr Clegg is expected to focus on his plans for a "fairer society".
He will underline opposition to Home Secretary Theresa May's suggestion that Britain could pull out of the European Convention on Human Rights.