David Cameron urged MPs from all parties - including Jeremy Corbyn's Labour - to back his call for military action against Islamic State (IS) in Syria.
The Prime Minister said a motion that the Commons will vote on on Wednesday has military action against IS - also known as Isil - as part of a "broader strategy" for the region.
With Mr Corbyn opposed to the extension of the bombing campaign from Iraq into neighbouring Syria and the prospect of a small rebellion on the Tory benches, Mr Cameron needs the backing of Labour MPs at odds with their leader to guarantee success in the vote.
Speaking from Downing Street he said: "I will be making the arguments and I hope as many Members of Parliament - across all parties - will support me as possible.
"We had a meeting of the Cabinet this morning and have agreed the motion that will be put in front of the House of Commons.
"That motion talks about, yes, the necessity of taking military action agains Isil in Syria as well as Iraq, but it is part of a broader strategy.
"It's about politics and diplomacy and humanitarian aid, all of which we need to bring to bear to bring peace to Syria but to make sure we protect our national interest of fighting against this appalling terrorist organisation."