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The leader of one of Britain's biggest trade unions has warned Jeremy Corbyn's stance on trident may rule him out as a future prime minister.
Sir Paul Kenny, the general secretary of the GMB, said there was already a "lot of debate" around Mr Corbyn's leadership.
He told Channel 4 News: "Maybe somebody else should be given the (nuclear) button."
David Cameron has said Labour cannot be trusted with Britain's national security in response to Jeremy Corbyn's answer on Trident.
When Mr Corbyn was asked if he would ever press the nuclear button if he was Prime Minister, he said: "No."
Labour party activists have endorsed an emergency motion calling for a UN resolution to be in place before party members support the expansion of British bombing of Isis targets in Syria.
MPs at the Labour party conference were told "a plan must be in place to deal with refugees in Europe" before a military campaign begins.
The motion, which is not legally binding on party MPs, came as Unite member Ivan Monckton warned of the dangers of "blundering into a new war".
He said: "Now is not the time to blunder into a new war - another illegal war - with untold human casualties, more death, destruction and chaos creating more refugees."
Shadow justice secretary Lord Falconer has failed to endorse Jeremy Corbyn when asked whether the Labour leader could one day be Prime Minister.
Lord Falconer said "the process by which somebody grows into the job of prime minister takes time."
Speaking on BBC's Daily Politics, he said: “It seems to me that at the start, people may not look to the nation that that’s the job that they’ll take up, but as time goes on, perceptions change.
"I mean, well, there’s five years before the general election, I think lots could happen, we are fighting for the Labour party for a Labour prime minister and Jeremy’s the Labour party.”
Jeremy Corbyn said his views are well known on nuclear weapons in response to criticism that he had "undermined" party policy by saying he would never launch a nuclear strike if he was prime minister.
Maria Eagle said the comments were "not helpful" and "undermined" party policy.
Responding to Eagle's comments, Mr Corbyn told reporters: "We will be having a discussion and a debate about nuclear weapons.
"We are going to have discussion and a debate about how we fulfil our obligations under the Nuclear Non-Proliferation Treaty and we will go forward from there.
"There's no decision required until probably next summer on this. I hold a view which is well known on nuclear weapons and it is a view which I have held all my life."
Political Editor Tom Bradby tweets:
Diane Abbott has said she is "surprised" that shadow defence secretary Maria Eagle has criticised Jeremy Corbyn for "making his position clear" on Trident.
Eagle said the comments the Labour leader had made, saying he would never launch a nuclear strike if he was prime minister, were "unhelpful" and "undermined" attempts to get a policy process going.
Shadow defence secretary Maria Eagle has criticised Jeremy Corbyn for saying he would not launch a nuclear strike if he was prime minister.
The Labour leader, who said he could "obviously" imagine being in Number 10, stressed he has a mandate from party members for his opposition to renewing the Trident nuclear deterrent.
But shadow defence secretary Maria Eagle said the comments were unhelpful and said they "undermined to some degree" the review she is carrying out of the party's defence policy.
Ms Eagle told the BBC that Labour's current policy is in favour of retaining a nuclear deterrent, adding: "I don't think that a potential prime minister answering a question like that, in the way in which he did, is helpful."
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