A source close to Wallasey MP Angela Eagle has said she would challenge Jeremy Corbyn's leadership "when the time is right".
It comes after her constituency Labour party said on its website they had passed a motion of support for Mr Corbyn 'with an overwhelming majority',
"Last night at our branch meeting Wallasey branch Labour Party passed, with an overwhelming majority, a motion of support for Jeremy Corbyn as Leader of the Labour Party .
"As such we wish to send our message of support to our Leader Jeremy Corbyn at this time as we work together on the larger issues effecting our society.
Mr Corbyn has resisted calls to step down as Labour leader after MPs voted by 172-40 that they had no confidence in him.
After the mass resignation of the bulk of Mr Corbyn's front bench team, the former shadow business secretary was understood to be considering a formal challenge to his position.
"Angela has made her position 100% clear but she will challenge when there is absolutely nothing left to fight for," the source said.
"There will be a challenge unless he goes."
On Mr Corbyn and activists such as Momentum who support him, the source said: "When people get weaker, they shout louder."
A vigil has taken place in Liverpool for murdered MP Jo Cox. The special tribute, at the city's Devonshire House Hotel, was organised by the Labour Party on Merseyside. Jo's colleague and friend, Wirral South MP Alison McGovern, told Granada Reports that the last few days have been "horrific".
The Labour Party announces the winner of its Leadership Ballot later today. North West MP Andy Burnham had been tipped to win the contest early in the campaign. But that was before the surge in support for left-wing candidate Jeremy Corbyn. He is now believed to be the front-runner to be party leader despite warnings from senior Labour figures that the North London MP will make the party unelectable.
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The final hustings in the Labour leadership campaign have been taking place in Warrington.
Leigh MP Andy Burnham is in second place in some of the polls, trailing surprise leader Jeremy Corbyn.
ITV correspondent Ashley Derricott reports.
Labour's leadership hopefuls are taking part in a North West hustings organised by the party in Warrington today.
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The Leigh MP, and Labour leadership candidate, Andy Burnham has told Granada Reports the party had a leader from the North West of England.
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