William Hague: 'Consensual' aim on Syria
28 August 2013 Last updated at 22:11 BST
MPs will have two votes before "direct" military action is taken by the UK in Syria, the government has proposed.
A Commons motion, to be debated on Thursday, also states the vote should be held after UN inspectors report on an alleged chemical attack there.
Labour had threatened to pull its support for the vote and said the PM had "changed his mind" under pressure.
However UK Foreign Secretary William Hague said the prime minister wanted the motion to move forward on a ''consensual basis.''