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Downing Street and White House officials are said to have earmarked just before or after the Normandy landings commemorations, which Mr Trump is scheduled to attend in France, as the best potential date. Crowds of protesters are likely to greet the billionaire if, as predicted, he is given the full treatment of a state banquet at Buckingham Palace and a carriage procession down The Mall, such as Barack and Michelle Obama enjoyed in 2011.

Trump to have banquet with Queen Elizabeth at Buckingham Palace

Theresa May sparked controversy by immediately promising Mr Trump a state visit shortly after he was elected in November 2016.

But his first presidential trip last July was downgraded to a "working visit" amid fierce opposition from MPs and the public.

An official announcement is expected in April once the Queen has issued a formal invitation, according to a report yesterday.

"Logistically, it would make sense if the President attends a state visit in June because he's planning to be in France for the D-Day anniversary," an official was quoted as saying.