Protests have taken place across the country, with many anti-Trump demonstrators holding placards and banging its and pans outside the London residence husband-and-wife are residing at.
At the same time, Trump will be touring a defense site with May outside of London.
Considering Trump's comments yesterday referring to the United Kingdom as "in turmoil", it will remain to be seen whether he keeps his silence on the issue during his visit today.
Last month, Labour member of Parliament Gavin Shuker ran down a list of objections to Trump: the separation of migrant families and detention of children; the USA departure from the United Nations' Human Rights Council; the US president's praise for North Korean leader Kim Jong Un.
Trump is not expected to spend time in central London.
"I think it's amusing".
The state visit has never been scheduled - there is fierce opposition to it in many quarters of Britain - and this trip is part of a working visit instead, meaning, among other things, that Trump will overnight at Winfield House, the USA ambassador's handsome residence near Regents Park rather than in Buckingham Palace or Windsor Castle as a guest of the queen.
He is due to stay overnight at the ambassador's Winfield House residence in London's Regent's Park, where demonstrators plan to play recordings of migrant children held in United States detention centers.
They added: "Rather than an attack on one minority, Trump is an attack on the idea of diversity, and the ability for people to live their lives in a way that doesn't affect anyone else...this is about standing in solidarity with this is about protecting our right to be different from one another and to get along".
He will then travel to Helsinki for a summit with Russian president Vladimir Putin.
The organisers behind the blimp however, said they were just "poking fun" and "hope Trump sees it".
London Mayor Sadiq Khan has come under fire for his approval of a blimp featuring US President Donald Trump dressed as a baby.
"The people voted to break it up, so I imagine that's what they'll do".
The middle son of the USA president is executive vice-president of the Trump Organisation and oversees the golf resorts.
The US Ambassador to London, Woody Johnson, insisted last week that Trump's itinerary was not intentionally designed for him to avoid encountering throngs of protesters.
On Saturday, Trump supporters will rally near the U.S. embassy in Nine Elms, 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.
The two leaders will hold talks at the prime minister's country residence of Chequers where Russia, Brexit and the Middle East will top the agenda.