Labour leader Jeremy Corbyn and Defence Secretary Michael Fallon interviewed by Andrew Marr
Mr Corbyn under pressure to allow his MPs a free vote on UK air strikes in Syria
Mr Fallon attempting to convince Parliament to back military intervention
A Commons vote is expected within weeks on whether to authorise military action
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Today Programme
BBC Radio 4
Earlier on, during his Today interview Shadow Chancellor John McDonnell said the Labour Party would have a discussion in "the normal way" on whether to back government plans to begin air strikes in Syria.
He said he was "hoping" there would be a "consensual position".
Quote MessageI'm really sceptical about British involvement in the Middle East, full stop, and I think we just need to learn the lessons from Iraq."
Image source, APSo-called Islamic State burst on to the international scene in 2014 when it seized large swathes of territory in Syria and Iraq.
Hear the story of, Nour a woman from Raqqa. The city has now become the so-called Islamic State's (IS) capital inside Syria.
She managed to escape the city and is now a refugee in Europe and the story is based on her experiences and those of her two sisters, who are still inside the IS-held city.
Image source, Getty ImagesAhead of today's statement from the Prime Minister urging action in Syria, here's a refresher on the conflict so far.
More than 250,000 Syrians have lost their lives in four-and-a-half years of armed conflict, which began with anti-government protests before escalating into a full-scale civil war.
More than 11 million others have been forced from their homes as forces loyal to President Bashar al-Assad and those opposed to his rule battle each other - as well as jihadist militants from Islamic State.
Read the story of the civil war, in this BBC guide.
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Image source, PAFrom about !0:30 GMT David Cameron will take to his feet in the Commons and warn of the threat posed by IS to the UK and say the country should not "sub-contract its security" to others.
A Commons vote is expected within weeks on whether to authorise air strikes.
Hello and welcome to our rolling coverage of Thursday's politics. David Cameron is to present his case for extending UK airstrikes against so-called Islamic State, to Syria. In a statement to the House of Commons later this morning, the prime minister will urge MPs to back military action as he sets out a "comprehensive strategy" to tackle the extremist group.