Last night, mayor of London Sadiq Khan called for the President's invite to be rescinded after Trump sent a series of tweets attacking Khan over the London Bridge terror attack.
But, speaking on the BBC's Today Programme, Johnson made it clear he did not agree, saying: "The invitation has been issued and accepted and I see no reason to change that."
Trump went after Khan on Twitter following the London bridge incident, not once, but twice, criticising him for calling on Londoners not to be alarmed by the increased police presence on their streets.
At least 7 dead and 48 wounded in terror attack and Mayor of London says there is "no reason to be alarmed!"— Donald J. Trump (@realDonaldTrump) June 4, 2017
Pathetic excuse by London Mayor Sadiq Khan who had to think fast on his "no reason to be alarmed" statement. MSM is working hard to sell it!— Donald J. Trump (@realDonaldTrump) June 5, 2017
Responding to Trump, Khan appeared on Channel 4 news last night to call for the President's state visit to be axed.
"I don't think we should roll out the red carpet to the President of the USA in the circumstances where his policies go against everything we stand for," Khan said.
"When you have a special relationship it is no different from when you have got a close mate. You stand with them in times of adversity but you call them out when they are wrong. There are many things about which Donald Trump is wrong."
This morning, Johnson made it clear he did not "wish to interpose myself in a row between the President and the mayor of London".