Trump is expected to face major protests during his trip to Britain, including a giant inflatable image of him as a crying baby to be flown near parliament on Friday. Some plan to stage an "all-night noise protest" outside the barricades surrounding Winfield House later Thursday, with those attending urged to "bring pots, drums and vuvuzelas".
May appears to have seen off an immediate challenge to her leadership from malcontents within her Conservative Party but Trump's comments ahead of the trip - that Britain was "in somewhat turmoil" and that it was up to the people if she stayed in power - fanned the sense of political crisis.
On the USA embassy: Trump cancelled his first planned visit earlier this year, saying the embassy's move from Grosvenor Square in Mayfair district to an "off location" at Nine Elms, south of the Thames, was a "bad deal".
The Trumps will travel to Scotland, where they will spend the weekend.
Acknowleging that Trump must "be defeated primarily in the U.S.", Global Justice Now organizer Sam Lund-Harket wrote in a blog post that it is the job of progressives in the U.K.to show solidarity with their American allies by turning out in large numbers to denounce the president's destructive and hate-filled agenda.
Trump has been quick to criticize British society, telling a National Rifle Association convention in May that the British didn't have guns but had so much knife crime that one hospital was like a military war zone with its floors awash with blood, a false statement quickly rebutted by British physicians and politicians.
The Queen's christening day in 1926
The 11-week-old will be baptised by the Archbishop of Canterbury , the Most Reverend Justin Welby , in the palace's Chapel Royal. Louis wore a handmade replica of the Royal Christening Robe, made by Angela Kelly , who is a dressmaker to the Queen.
The U.S. embassy has also responded in kind, issuing a warning to American citizens to "keep a low profile" and "exercise caution" during Trump's visit. "It's really kind of irrelevant to what we're trying to do, and doesn't express the opinion of the British people that I've met", he told the BBC's Today programme.
On Saturday, Trump supporters will rally near the U.S. embassy in Vauxhall, south London, for an event titled "Welcoming Trump to Britain Rally - Make Britain Great Again", at which a number of right-wing figures are scheduled to speak.
He will then travel to Helsinki for a summit with Russian president Vladimir Putin.
As May and Trump hold talks throughout the week, Philip will be expected to entertain Melania during the visit.
"I think that's absolutely disgusting", Eugene Bibby, who runs a domestic appliance fix shop in Tommyfield Market in Oldham, told Fox News about the balloon.