Trump angered May and many Britons by tweeting inflammatory and unverified videos made by Britain First, an anti-Muslim group whose leaders have been convicted of hate crimes, and by characterizing parts of London and other cities as no-go areas because of a purported Muslim-related crime wave.
But the red carpet treatment is likely to be overshadowed by massive protests planned by Britons opposed to Trump's presence.
Tens of thousands of people are expected to protest against Trump's visit in central London on Friday, citing his alleged Islamophobia, controversial policies and "incendiary rhetoric" towards people with disabilities and the LGBTQ community.
The U.S. president's brash style and hardline "America First" policies have caused consternation across Britain's political spectrum and society.
"If the president wants to do something, we'll make it possible".
On Friday, Trump will join May at a United Kingdom military demonstration at a defense site, after which they will go to May's country home Chequers for bilateral talks, according to the Evening Standard.
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The controversy didn't stop Mr Johnson from publicly slamming the government's Brexit approach again months later. Labour deputy leader Tom Watson said: "Theresa May's Government is in meltdown ".
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"Exercise caution if unexpectedly in the vicinity of large gatherings that may become violent", the embassy said in a list of advised actions, asking Americans to "keep a low profile" and "be aware of your surroundings".
There might have been a considerable lack of disrespectful fanfare when USA president Donald Trump was in Singapore last month, but Londoners, as it would appear, have a particularly in-your-face way of expressing themselves.
Mr Smyth said he hoped the protests, and specifically the Trump baby blimp, do not upset the American public.
The reason: demonstrations are planned against President Donald Trump, in London, as well as Windsor, Bristol, Newcastle, Leeds, Cambridge, Cardiff, Glasgow and the west coast of Scotland, where Trump has a golf course.
Amid reports that the government is working to bring a major police presence to the demonstrations, Amnesty International warned British authorities against attempting to stamp out freedom of expression in an effort to "appease their visitors".
From there, Trump and his wife Melania are expected to travel to Windsor to meet Queen Elizabeth.