British MPs will vote on airstrikes against Islamic State targets in Syria following a one-day debate on Wednesday, David Cameron has said.
The Prime Minister's decision comes after Jeremy Corbyn granted Labour MPs a free vote on military action despite his opposition.
That means Mr Cameron looks to have the "clear majority" he wanted before bringing Syrian airstrikes to the Commons for a second time.
He told Sky News: "I believe there is growing support across Parliament for the compelling case there is to answer the call from our allies to act against ISIL (IS) in Syria and Iraq.
"The headquarters of the terrorists is in Syria and it makes no sense to recognise this border in the action we take when ISIL themselves don't.
"It's in the national interest, it's the right thing to do. We'll be acting with our allies and we'll be careful and responsible as we do.
"In my view it's the right thing to do this to help keep our country safe."
British Foreign Secretary Philip Hammond has said he is confident a majority can be secured.
Mr Corbyn had asked for a two-day debate on the "highly complex situation" but this has not been granted.
His decision to grant a free vote came amid threats of resignations from the shadow cabinet if he tried to impose his will.
A two-hour meeting of the shadow cabinet heard that as many as 43% of Labour MPs - amounting to almost 100 - back airstrikes.
This would be enough to prevent a repeat of the humiliating defeat suffered by Mr Cameron in 2013 when he sought approval for action against Syria's president Bashar al-Assad.
Despite offering his MPs a free vote, Mr Corbyn will make clear that the party's official policy is to oppose military action.
But his new position has been criticised by the SNP, which has indicated it will not support Mr Cameron.
Leader Nicola Sturgeon tweeted: "So a party that says it is anti-airstrikes has just made a vote for airstrikes more likely?! Go figure."
A Downing Street spokesman said earlier on Monday that discussions were under way within Government on the wording of a draft motion, covering not only military action but also counter-extremism, the diplomatic and political process and humanitarian efforts.
