Workers Party of Britain leader George Galloway has said his party could put pressure on Labour from the left in the way Reform UK was targeting the Tories on the right.
Mr Galloway said his party had 500 candidates ready and hoped to stand in most English seats at the general election as well as targeting some in Scotland and Wales.
He said: "We are confident that we're going to be competitive in virtually every race.
"We will, I think, be short of candidates in Wales and Scotland, but we're quite confident that in the vast majority of seats in England - except those that we've decided not to stand in for political reasons - that we will be on the ballot.
"And so people will not have to choose between Tweedledee and Tweedledum. They'll have a genuine choice. And we think that's our duty to offer that."
He claimed he was in talks with three Labour MPs about defecting.
"Talks were going swimmingly, then not, then back on again. These things take time.
"I'm hoping to land them, I'm an experienced fisherman, I'm hoping to land them on the riverbank in good time."