Ian Byrne will have to undergo reselection to remain Labour’s West Derby MP.
Mr Byrne was installed as the area’s representative at the 2019 General Election following the retirement of long-serving incumbent Stephen Twigg.
The 50-year-old is a co-founder of Fans Supporting Foodbanks and has campaigned for the Right to Food to be enshrined to protect people in poverty.
But Labour have chosen not to automatically re-select him as their candidate for the next General Election after a series of votes among its local branches.
Mr Byrne has vowed to fight for his existing seat, which the party has advised any potential challengers to register their interest by midday on October 20.
“I am disappointed that the party has decided to press ahead with a full selection when concerns about the integrity of the process have not been resolved,” he said in a statement.
“It is a privilege to represent the people of West Derby and I am grateful for the mandate you have given me to be a crusading MP on the issues of food poverty and hunger and to lead on the campaign for a Hillsborough Law in Parliament, working alongside Andy Burnham, Steve Rotheram and Maria Eagle.
“Since becoming an MP in 2019, I have worked tirelessly on behalf of workers in struggle, pensioners and our fifties born women, spoken up for renters, carers, dementia sufferers; supported our trade unions; defended our NHS and its staff and successfully campaigned to add Hillsborough to the school curriculum.
“Britain needs MPs who care about those most in needs, as indeed does West Derby. The cost of living crisis is hitting our constituency hard.
“I am seeking re-election to be Labour candidate for West Derby and I ask everyone who can do so to join my grassroots campaign to make sure the people of West Derby continue to have someone fighting for them in Parliament.”
West Derby is considered to be among Labour’s safest parliamentary seats in the country, with its curent majorty standing at almost 30,000 votes.