On Thursday, Prime Minister David Cameron said it was time to join air strikes against militants in Syria because Britain cannot "subcontract its security to other countries" and urged lawmakers to give their support for military action.
After losing a vote in parliament on strikes against Syrian President Bashar al-Assad in 2013, Cameron must convince some members of his Conservative Party and some Labour lawmakers that a bombing campaign was needed.
Corbyn, a veteran anti-war campaigner, wrote to his lawmakers late on Thursday to say Cameron had not made a convincing case and he could not support action -- a viewpoint not shared by several of his shadow cabinet.
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