LABOUR MPs have a “duty” to rally behind Jeremy Corbyn if he’s elected leader, the frontrunner for the deputy post Tom Watson said yesterday.

Asked about the prospects for party discipline if the left candidate was elected, Mr Watson predicted he may face right-wing rebels.

But he said: “I think as MPs what we first of all have to recognise that our members have chosen the leader. It’s our job to make that work.

In the interview with the Huffington Post, the West Bromwich MP was also asked whether he was proud of an endorsement from Harry Potter author JK Rowling.

He said: “If I’ve got one celebrity endorsement that I’m very proud of, it’s Dennis Skinner — that’s definitely a badge of honour for me.”