A senior Labour MP has tabled a motion of no confidence in Jeremy Corbyn following the referendum vote to leave the EU.
Dame Margaret Hodge has submitted a motion - seconded by backbencher Ann Coffey - to the Parliamentary Labour Party, her office said.
Although the motion has no formal status it is expected to form the the basis of a discussion in the Parliamentary Labour Party.
Former shadow chancellor Chris Leslie said he was "not surprised" at the move and called on Mr Corbyn to consider his position.
"I would say today he does need to consider his position and think about whether he should do the honourable thing," he told BBC News.
"Every MP is going to have to search their conscience about it but I think I would need an awful lot of persuading to have confidence in Jeremy's leadership going into a general election."
Dame Margaret urged Mr Corbyn to "do the decent thing" and stand down in the way that David Cameron had.
"The European referendum was a test of leadership and I think Jeremy failed that test," she told Sky News.
"He came out too slowly, he was very half-hearted about his attempts to campaign and Labour voters simply didn't get the message."