John Woodcock, the MP for Barrow and Furness, has quit the Labour Party and will sit in the Commons as an independent.
He had been suspended from Labour over a sexual harassment allegation which he denied.
Woodcock, a strong critic of Jeremy Corbyn’s leadership of the party, said the investigation into the allegation was political motivated.
In a letter to Corbyn on Wednesday morning, Woodcock said he was quitting the party over the Labour leader’s refusal to appoint an independent investigator to oversee the inquiry.
“The party for which I have campaigned since I was a boy is no longer the broad church it has always historically been,” Woodcock said.
“Anti-Semitism is being tolerated and Labour has been taken over at nearly every level by the hard left.”
Woodock said under those circumstances it was “not credible” that he would receive a fair hearing from the party.
More to follow.