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The Foreign Secretary reminded the Labour heavyweights the US is the “biggest single investor” in Britain and urged them not to put the “crucial relationship at risk”. He tweeted: "The US is the biggest single investor in the UK - yet Khan & Corbyn seem determined to put this crucial relationship at risk. "We will not allow US-UK relations to be endangered by some puffed up pompous popinjay in City Hall." The US leader was due to be the guest of honour at the opening of the new American embassy in London, but in tweet last night, Mr Trump announced he would no longer be attending. THE REAL REASON DONALD TRUMP CANCELLED HIS UK VISIT REVEALED

GETTY Boris Johnson has hit back at Corbyn and Khan

The US is the biggest single investor in the UK - yet Khan & Corbyn seem determined to put this crucial relationship at risk Boris Johnson

He cited the fact the Obama administration had opted to re-locate the embassy from its current location in Mayfair to a purpose-built £750 million facility south of the Thames as the reason for scrapping his trip, adding the move was a “bad deal”. Boris Johnson's intervention comes after London Mayor Mr Khan celebrated Mr Trump's decision not to come to London, saying the US leader had "got the message". Mr Khan - who has clashed with the president in the past - said a visit by Mr Trump would have been met by "mass peaceful protests" in the capital, which have been backed by Labour leader Mr Corbyn. Ukip's Nigel Farage has also blamed Mr Corbyn and Mr Kahn for putting Mr Trump off visiting the country.

GETTY Sadiq Khan has clashed with the US president on numerous occasions

Donald Trump's most memorable tweets as president Fri, April 21, 2017 Donald Trump's most memorable tweets since elected as President of the United States Play slideshow REUTERS 1 of 22 Donald Trump tweets his way through presidency

The former Ukip leader told BBC Radio 4’s Today programme: “It’s disappointing. He’s been to countries all over the world and yet he’s not been to the one with whom he’s closest. “I think it’s disappointing. “Maybe just maybe Sadiq Khan, Jeremy Corbyn and the Labour party planning mass protests, maybe those optics he didn’t like the look of.” Downing Street said the "strong and deep" partnership between Britain and the United States "will endure" despite Donald Trump cancelling plans to visit London. A spokeman said: "As we have said number of times, an invitation for a state visit has been extended and accepted. No date was confirmed for any visit. "The opening of the US embassy is a matter for the US. "But the US is one of our oldest and most valued allies and our strong and deep partnership will endure."

GETTY Corbyn has been accused of encouraging protests against Trump