George Eaton is political editor of the New Statesman.
There is no agreement on whether the leader would make the ballot or whether Angela Eagle or Owen Smith would be the challenger.
George Osborne's decision to abandon his budget surplus rule is an acknowledgment of economic reality.
MPs hope that Jeremy Corbyn may yet resign, while Owen Smith is competing with Angela Eagle to be the candidate.
It is the Labour leader's sense of obligation to his supporters that sustains him.
Letter demands Corbyn's departure and attacks his office for "promoting" the work of the Leave campaign.
"For heaven's sake man, go!" The PM's appeal was sincere but the Labour leader can turn it to his advantage.
Labour's deputy leader is the potential candidate most feared by Corbyn's supporters.
The former shadow first secretary of state is the "unity candidate" of choice. But don't rule out a bid by Yvette Cooper.
The leader's decision to fight the rebels sets the stage for a new leadership contest or a protracted legal battle.
Margaret Hodge and Ann Coffey have submitted a motion ahead of Monday's PLP meeting.
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