Today Programme
BBC Radio 4

The BBC's Political Editor Laura Kuenssberg tells Today that it looks like that around 320 Conservative MPs back UK bombing of IS targets in Syria, with the number of rebels down to about 10. She says around 50 Labour MPs have said or indicated they back the bombing. With possible backing from the DUP that could bring the number of those backing the motion to around 380, safely above the 325 majority required.

Laura Kuenssberg says that the size of the majority does matter and "unless something unexpected happens", it looks like David Cameron is on track for the sort of majority he wants.

The government should not support the building of a third runway at Heathrow until a number of environmental conditions can be met, MPs have said.

The Airports Commission, external published a report backing a third runway in July.

But the House of Commons Environmental Audit Committee report said firm plans to deal with climate-changing emissions, air quality and noise need to be put in place.

A final government decision is expected by the end of the year.

Labour MP Huw Irranca-Davies, chairman of the committee, said it would be "irresponsible" to postpone dealing with the environmental impact of expansion at Heathrow.

He warned that to do so "could lead to legal challenges as a result of the potential damage to public health from increased air pollution and noise".

BBC business editor Kamal Ahmed said senior sources at the company that runs Heathrow have told him the "mood music" around the decision to expand is in favour of the third runway being approved.

Read our full story

Labour is to launch its campaign for the UK to stay in the EU later, and will say the country's security depends on its continued membership.

The campaign, led by ex-Home Secretary Alan Johnson, will be run separately to the cross-party, pro-EU campaign.

He will say the Paris attacks underline the need for Britain to "stand shoulder to shoulder with our allies in Europe".

David Cameron is to hold an in/out vote on the EU by the end of 2017, but an exact date has not yet been set.

The prime minister is keen to press ahead with the vote but has said he will not set the date until he has secured an agreement from the other EU leaders on his renegotiations.

Mr Cameron has said he wants the UK to stay in a reformed EU, but has not ruled out recommending leaving if he cannot secure the change he wants.

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Laura Kuenssberg
BBC political editor

Will we be bombing Syria by the end of the week?

It seems glib even to ask that question in just one sentence, yet that is what MPs and many of the public will be asking, after the prime minister announced his intention to call a vote on extending air strikes to Syria on Wednesday.

By the prime minister's calculation, the answer must be, we may well be. Defence sources say that the RAF could move extremely fast following parliamentary approval. And the less straightforward assessment of whether the government will get the numbers in the vote, has clearly been answered within government with a confident yes.

David Cameron was always adamant that he would only take the question to the House of Commons if he could be absolutely sure of getting a majority.

A fair number of MPs are yet to decide, so numbers could fluctuate in the coming days. But a totting up of the likely sums suggests that ministers are secure of getting what they want.

Read Laura's blog in full

The maths of the vote has been the focus of a lot of attention because there are enough likely Conservative rebels to mean David Cameron will need some support from some opposition MPs to win. 

Crucial, therefore, to the PM's decision to call the vote was the decision on Monday afternoon for Jeremy Corbyn to grant Labour MPs a free vote on UK air strikes in Syria.

Mr Corbyn had wanted Labour to oppose air strikes, but was forced to back down by his shadow cabinet.

BBC chief political correspondent Vicki Young said she was told Mr Corbyn was given a "thorough kicking" at the meeting with his shadow cabinet after which the free vote was announced.

Catch up with our full story on Labour's free vote from Monday

Hello and welcome to our coverage of Tuesday's political developments. The morning is dominated by David Cameron's announcement last night that there will be a debate and vote tomorrow on whether the UK should extend its bombing of IS targets to Syria (at the moment the UK does bomb IS targets in Iraq).

Read our full story here

Our rolling political coverage will resume at 08:00 GMT on Tuesday, when there's sure to be more reaction to David Cameron's announcement that he will call a one-day Commons debate and vote on Wednesday over UK air strikes against so-called Islamic State in Syria.

But before we say goodnight, here's a round-up of today's political stories.

• The prime minister said there was "growing" parliamentary support for air strikes against IS targets in Syria, saying it was "the right thing to do" and in the national interest
• The move came after Labour leader Jeremy Corbyn said he would grant his MPs a free vote on the matter. Mr Corbyn had wanted Labour to oppose air strikes, but was forced to back down by his shadow cabinet
• Mr Corbyn has criticised Mr Cameron for not allowing a two-day debate on the proposed air strikes, and said it shows the PM's case for military intervention in Syria is "falling apart"
• Tuesday's 24-hour strike by junior doctors in England has been called off, but major disruption has already been caused as thousands of operations have been cancelled
• A tax on sugary drinks should be introduced as part of a "bold and urgent" set of measures to tackle child obesity in England, MPs have said
• US President Barack Obama has said the UN climate conference in Paris could be a "turning point" in global efforts to limit future temperature rises
• The government has announced plans to open a 43-mile section of the HS2 high-speed rail link between Birmingham and Crewe in 2027, six years earlier than originally hoped for
• Children in foster care make better educational progress than vulnerable children who remain with troubled families, research suggests

 "By refusing a full two-day debate, David Cameron is demonstrating he knows the debate is running away from him, and that the case he made last week is falling apart.

"The prime minister should stop the rush to war to allow for a full discussion of the issues in Parliament. 

"Matters of national security are far too important to be bulldozed through the House of Commons for political convenience."

John Howell, Tory MP for Henley, welcomed the government's bid to extend bombing into Syria. 

"Sadly it has taken the tragedy of Paris to open our eyes to the fact that this a problem that we cannot afford to ignore any longer," he said.

"If Isil is allowed to fester we will see a continuation of the ethnic cleansing, indoctrination of future generations in Isil-held territory and thousands more displaced Syrians and Iraqis."

John Mann told the BBC he would be voting against air strikes, along with "quite a large group" of fellow Labour MPs.

"I don't think that what David Cameron's proposing is any more than a small gesture. It won't work, it won't get rid of ISIS. I want to get rid of ISIS. And that will require a multi national force, it will require the Arab nations, Russia and it should be done with the United Nations. And I think that's achievable."

The shadow leader of the House, Chris Bryant, has called for a statement in the Commons to be made at 22:00 GMT about Wednesday's debate and vote. 

MPs should be able to table amendments to the government's motion, he said.

"I just say to the government, there are many on all sides of this House who want to listen to proper debate on a matter which is not straightforward and simple, and any shenanigans, any attempt to bounce the House into a decision would be wholly regrettable."

Mr Cameron said confining UK action to Iraq "makes no sense" when IS itself does not recognise its border with Syria. 

He said he wanted MPs to be able to have "full consideration, to make speeches, to make points, to ask me questions, to examine the government's case". 

Responding to Labour leader Jeremy Corbyn's call for a two-day debate, the prime minister said: "We will take the action necessary to make sure we have, in many ways, the equivalent number of questions we would often have across a two-day debate in one day."

Mr Cameron said there was growing cross-party support for air strikes but there would be a "long and full debate" in the House of Commons. The whole strategy against IS would take time, he added.

Speaking in Downing Street, the prime minister said: "I will be recommending to Cabinet tomorrow that we hold a debate and a vote in the House of Commons to extend the air strikes that we have carried out against Isil [Islamic State] in Iraq to Syria, that we answer the call from our allies and work with them because Isil is a threat to our country and this is the right thing to do."

BBC political correspondent Vicki Young said the prime minister had decided to extend the Parliamentary day and there could be about nine hours of debate before the vote.

Prime Minister David Cameron has said he will call a one-day debate and a Commons vote on air strikes in Syria on Wednesday.