The White House insisted Trump knew nothing about the party or its leader Jayda Fransen when he shared the inflammatory videos, and Johnson said his intentions were simply misunderstood.
Asked about the visit, USA ambassador Mr Johnson told BBC Radio 4's Today programme: 'Absolutely, I think he will come. "We are doing just fine!" "I think the way he looks at it is that security is his number one oath, it's protecting Americans". Is he going to be flawless in appeasing everybody?
The ambassador added: "He is not going to go down the path of a lot of politicians and maybe be namby-pamby about it". He's probably going to take some chances, and an effort to achieve that security goal may be that he'll ruffle some feathers.
However, Trump's decision to retweet propaganda from far-right extremist group Britain First sparked a fierce backlash in the United Kingdom and his subsequent attack on the PM has hardened calls for the government to withdraw the invitation of a state visit. Stella Creasy, the Labour MP for Walthamstow, opposed the visit and said British people deserved a special relationship that works "both ways"."By sharing and promoting videos by Britain First he's undermined our democratic process and put at risk people in our communities", she told Radio 4.
Twitter officially launches 'threads' to make 'tweetstorms' easier
You write the first tweet, then a response to that tweet, then another response, and so on until you're done. If you want to update a thread later, open it and hit "add another tweet" in the thread .
Another Labour MP, Wes Streeting, wrote on Twitter: "Not often I'll side with Theresa May, but this is a joke. Trump is the antithesis of these".
Talks about President Trump's proposed working visit to London in February have not progressed beyond likely dates, according to senior government figures.
Tory backbencher Michael Fabricant has slammed "tedious gesture politics" after reports women were planning to wear bright pink to protest Mr Trump's visit.