On Wednesday, Buckingham Palace said Trump will be greeted by an honour guard and will receive a royal salute before the U.S. national anthem is played.
WATCH: Trump faces protests on UK visit, May facing further political fallout
Trump and his wife will then have tea with the Queen inside the castle. Buckingham Palace did not specify if the Queen’s husband Prince Philip would attend, who has retired from public duties.
Trump has previously said his Scottish mother, who died years ago, loved the royal family.
WATCH: Donald Trump accepts Queen Elizabeth’s invitation for a state visit
“Any time the Queen was on television, an event, my mother would be watching. Crazy, right?” Trump told the Times. “She loved the Queen, … she was so proud of the Queen. She loved the ceremonial and the beauty, because nobody does that like the English.”
This is Trump’s first visit to the U.K. since becoming president, and he also will be attending a black-tie dinner hosted by Prime Minister Theresa May at Blenheim Palace, the birthplace of Winston Churchill, on Thursday evening.
Mass protests are expected in London on Friday when Trump is in town. The city’s mayor, Sadiq Khan, has even given approval of a giant “Trump Baby” balloon to be flown close to Parliament during his visit.
The visit is Trump’s first trip to Britain since becoming president.
— With files from the Associated Press