David Cameron is about to face the House of Commons for the first time since he vetoed a proposed EU treaty, amid signs of a coalition split.
The prime minister's actions have been described as "bitterly" disappointing by his deputy Nick Clegg, who will sit alongside him in the House of Commons during the statement at 3.30PM this afternoon.
Clegg admitted on Sunday he was only told about David Cameron's decision to wield Britain's veto at the EU summit after the event, and said it could lead to Britain being "marginalised" in the EU.
Liberal Democrat backbenchers are expected to attack the prime minister this afternoon following their leader's comments, although backbenchers have welcomed the move.
Cracks have also appeared in the Conservative party, with europhile justice secretary Ken Clarke describing Cameron's decision as "disappointing" and "surprising".
Labour former foreign secretary David Miliband told Radio 4's Today programme on Monday morning that it was "the first veto in history not to stop something".