Speaking on his GB News show, Mr Farage said: “Let's face it, folks, we knew for the last few weeks that some kind of major attack was going to happen on Iran. It was very, very clearly signposted indeed.

"When American envoy Steve Witkoff said they could only be a week away from a nuclear weapon, it didn't take much working out what was going to happen.

“But we are flat-footed. We are hopeless. We are useless. We've upset the Americans. We've upset the Cypriots, we've upset the UAE, we've upset Bahrain, we've upset goodness knows how many countries, and all the Prime Minister can do is say, ‘Let's do a deal with this murderous regime in Iran’.

“You know what I think? I think the man's a coward, and I think he is pandering to an increased influence of sectarian interest in British politics and the leftward direction of his own party.

“That's my view. I don't apologise for it. I mean it.”

It comes after the Prime Minister was forced to deny the Government's response to the Iran conflict had been marked by "indecision, prevarication and a lack of preparedness" at the Downing Street press conference.

Sir Keir also insisted the special relationship is "in operation right now" despite not having spoken to Donald Trump since a public spat erupted over his refusal to allow initial US strikes on Iran from British bases.

The US President has repeatedly rebuked Sir Keir, including branding him "no Winston Churchill".