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."
More top news
There's no love lost between Boris Johnson and Theresa May.
Eagle, who was one of 20 members of the shadow cabinet to resign, will formally announce her intention to stand on Thursday.
ITV News visits the rural county in the wake of the EU referendum result and finds increasing frustration with Britain's political leaders.