On Friday night, the president will travel to Scotland, Turnberry, the South Ayrshire golf resort he bought in 2014.
Yet Trump's schedule will largely keep him out of central London. Photos show the balloon being inflated Tuesday.
But as President Trump arrives in Britain on Thursday, he will find plenty of people who think it is more important to oppose him than it is to nurture U.S. -U.K. ties.
After spending the night at the United States ambassador's official residence in Regent's Park, London, the U.S. president will join the Theresa May at a military base on Friday to view a joint counter-terrorism exercise involving UK and USA special forces.
A small demonstration is expected to take place near Blenheim Palace in Oxfordshire on Thursday, the venue for Trump's black-tie dinner with Prime Minister Theresa May.
He told reporters they will have "substantive bilateral talks".
The British are usually polite to a fault - though they have been known to go off after a soccer match or once the pubs close.
There are fears that demonstrations during Trump's three-day visit to the United Kingdom from Thursday could turn violent.
"Give us your tired and your oppressed and we'll divide you from your children", he said of Trump's policies.
She says they have "turned a blind eye" to the situation.
It explains that "numerous demonstrations" have been planned for President Trump's visit between July 12 and 14, with most of those in central London, and large crowds expected.
He has also said he might speak to Boris Johnson, who quit as foreign secretary over May's plans.
On social media, some accused the State Department of scare-mongering.
The US embassy's alert to American citizens was an unusual step, CNN reported. The protocol is that if embassy staff are warned internally about possible threats, then the American public must be as well, she said.
Trump has done more damage to North Atlantic Treaty Organisation in months than Russian Federation has in decades Trump takes credit for increased defense spending by North Atlantic Treaty Organisation allies, but says "it isn't almost enough" Trump questions how Russian Federation probe can "proceed" given Federal Bureau of Investigation agent's private comments MORE on Thursday downplayed expected protests during his visit to the United Kingdom, saying he believes its citizens "like me a lot".