David Cameron has urged Labour MPs to back plans for the RAF to join airstrikes in Syria, saying they should "do the right thing" and "vote on the basis of the arguments".
Labour leader Jeremy Corbyn sparked a furious backlash from MPs when he announced that he could not support military intervention, despite the shadow cabinet not having agreed a position on the issue.
Frontbenchers including shadow education secretary Emily Thornberry have warned that Corbyn faces a rebellion if he tries to whip MPs into voting with him.
Speaking in Malta ahead of a Commonwealth summit, the Prime Minister encouraged wavering MPs to support his motion, saying he believed there was a "compelling case" to take "effective action" in Syria.
I thought many Members of Parliament on all sides of the House of Commons yesterday agreed there was a compelling case, so I would urge all of them to vote on the basis of the arguments for effective action on a compelling case to keep our country safe.
Vote on those arguments and we can do the right thing.
Protesters gathered outside Downing Street to urge MPs to vote down plans to bomb the war-torn country
Divisions within Labour appeared to grow over the question of airstrikes on Syria, as shadow chancellor John McDonnell backed a free vote.
A Labour source reveals the (un)pleasantries at the shadow front bench meeting, including a confrontation between two high-profile members.