Labour Leader Jeremy Corbyn could face a challenge to his authority, if the Prime Minister calls for a parliamentary vote on military action in Syria.
As many as 50 Labour MPs are prepared to defy the Labour Leader and vote for British intervention to the crisis, according to The Observer.
This leaves Jeremy Corbyn with a decision to make.
Should he allow his MPs a free vote, risking a result he doesn't agree with, or should he impose the whip and risk facing a rebellion in the very early stages of his leadership?
Labour MP Jo Cox and the Minister for International Development Andrew Mitchell have co-written a piece in The Observer calling the crisis in Syria: "Our generation's test, our responsibility."
They write: "Some may think that a military component has no place in an ethical response to Syria. We completely disagree...
"What is critical is that the protection of civilians must be at the centre of the mission."
Diane Abbott, the Shadow Minister for International Development, has reacted, tweeting: "Bombing Syria won't help refugees and could actually create more."
And in an interview with Dermot Murnaghan on Sky News, former international development secretary Clare Short warned bombing Syria "won't change anything" - as there is no concrete solution to the crisis.
As cross-party support for action in Syria grows, the Prime Minister will be under increasing pressure to consider British intervention.
And it's possible that the general direction of the Parliamentary Labour Party on this issue is not the same direction as its leader, Jeremy Corbyn.
