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BERLIN (Reuters) - Brexit campaigner Nigel Farage said on Friday that British Prime Minister Theresa May might be out of a job by Christmas unless she manages to get her party behind her and take charge of Brexit negotiations.

Speaking at an election campaign event for the right-wing Alternative for Germany (AfD) in Berlin, Farage said May needed to rapidly assert her authority over her Conservatives and also over the Brexit negotiations.

“If she doesn’t do those two things - doesn’t get some sense of order back into her own party and direction back into where the negotiations are going then I think the whispering campaign will go from something that is being done in private to being done in public and she might not last til Christmas,” he said.

At a citadel on the outskirts of Germany’s capital, Farage said leading British ministers have been contradicting each other on a weekly basis so the government looked rudderless.

“She has to stamp her authority on the party and do so pretty damn quickly,” said Farage, who while leader of the anti-EU UKIP Party played an important role in pressuring then-Prime Minister David Cameron to hold the Brexit referendum.