The trip includes meetings with Prime Minister Theresa May, who has described the U.S. as Britain's strongest ally, and is determined to secure a trade deal after the country acts on Brexit and leaves the European Union in March 2019.
May's "business-friendly" Brexit proposal was agreed by her cabinet only last Friday after two years of wrangling since Britons voted to leave the bloc in a 2016 referendum, though some supporters of Brexit cast it as a betrayal.
"I would say Brexit is Brexit, the people wanted to break it up so I would imagine this is what they will do".
Evie, who's 26, is also an American living in the UK.
But protests against Mr Trump have already started, with about a dozen activists from Stand Up to Racism Scotland staging a brief demo outside the Turnberry course on Wednesday.
Trump's trip is the latest installment of the "special relationship" the U.S. and United Kingdom share, which has been a decades-long diplomatic and political bond.
She said: "There is no stronger alliance than that of our special relationship with the United States and there will be no alliance more important in the years ahead".
"This week we have an opportunity to deepen this unique trading relationship and begin discussions about how we will forge a strengthened, ambitious and future-proof trade partnership".
Despite the welcome from May, many Britons are opposed to Trump's visit.
One Facebook page advertising a London protest against Trump's first visit to Britain as president has around 60,000 people saying they will attend. "I think they like me a lot in the United Kingdom".
"The president knows how important the special relationship is firsthand and that's why the bust of Churchill is actually in the Oval Office as we speak".
Meanwhile, in the capital city thousands will gather in a various of protests to voice their views against the USA president, including a march that could be attended by as many as 50,000 people and a flying protest involving the "Baby Trump" balloon.
Trump next heads to Windsor Castle later Friday for tea with the queen, as protesters stage a mass demonstration in London.
The six-metre high blimp, dubbed "Trump Baby", has been granted permission to fly above Parliament Square for two hours on Friday morning.
A small demonstration is expected to take place near Blenheim Palace in Oxfordshire on Thursday, the venue for Trump's black-tie dinner with May on Thursday evening.
He will spend just one night in the capital before going to Prime Minister Theresa May's country retreat Chequers in Buckinghamshire.