Joe Biden has crashed into the row over Boris Johnson's law-breaking Brexit plan - and warned it could scupper a US-UK trade deal.
The Presidential frontrunner joint mounting anger in the US Congress as he warned he would not let Northern Irish peace become a "casualty of Brexit".
Tory ministers were scrambling to downplay the warning the morning, insisting their plan would not breach the 1998 Good Friday Agreement.
But the Democratic candidate's intervention piles pressure on Boris Johnson, despite the Prime Minister agreeing a climbdown last night.
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