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Labour's defence chief has ruled out reviewing Trident if the party wins the general election - and could even widen the bombing campaign against Islamic State.

Nia Griffith confirmed Labour was committed to the submarine-based weapons system - and the policy would not be up for debate in a post-election strategic defence and security review.

Incoming governments traditionally order a major military assessment of what the UK needs to protect itself.

Jeremy Corbyn has signalled it would include the Trident weapons system if he was Prime Minister.

But rebuking her leader in an exclusive Mirror interview, Shadow Defence Secretary Ms Griffith said it would “absolutely” not be in the review and Labour was committed to replacing the four Vanguard subs.

“An SDSR would not include a review of Trident because we are committed to the Trident nuclear deterrent and we are committed to the four submarines,” she said.

Asked if she was frustrated at attempts to undermine the official position, she added: “We have a very clear party policy and that is what I’m spelling out.

(Image: PA Wire)

“That’s not dreamt up by one person, that’s a party policy that’s been agreed by our national policy forum.”

Ms Griffith slapped down Shadow Foreign Secretary Emily Thornberry at the weekend after she suggested Trident was up for review - being party policy.

Speaking to the Chatham House think tank earlier this month, veteran peace and CND campaigner Mr Corbyn refused to commit to a like-for-like replacement of the UK’s continuous-at-sea-deterrent.

He also pledged that RAF bombing raids on ISIS targets in Syria and Iraq would be immediately reviewed should Labour win on June 8.

(Image: ITV)

But Ms Griffith, confirmed a Labour government would “absolutely” continue the air raids on ISIS.

And the party spokeswoman, who visited British Top Guns engaged in Operation Shader - the military’s codename for the mission against ISIS - at RAF Akrotiri in Cyprus, suggested the campaign could even be extended.

Typhoons, Tornados and drones currently only target the terror group in Syria and Iraq.

But stressing Labour was “fully committed to the fight against Daesh and to working with coalition partners to that end,” she added: “It’s important not only that we see the liberation of cities like Mosul (in Iraq), but that we work with our allies like Iraq to maintain freedom from Daesh in those areas - that’s the challenge, that we don’t see Daesh re-merging in those areas.

“And we then need to pursue Daesh in areas where it does re-emerge, wherever they decide to recruit, be that sub-Saharan Africa or wherever.”

The revelation that Labour could extend RAF sorties to tackle Islamic extremists in other theatres risks another row between Ms Griffith and her party leader.

The pair have regularly clashed over the party’s defence policies - and Ms Griffith fought hard to have a commitment to NATO included in the election manifesto, promising to spend “at least 2% of GDP on defence” - a key benchmark of alliance membership.

Even then, she boycotted last week’s official manifesto launch in Bradford to campaign in her South Wales constituency instead.