Extra police will be stationed at Stansted Airport today as President Trump flies in.
As with previous presidential visits, Airforce One will land at the Essex terminal.
Low-flying aircraft will also be banned at various times around the airport on the grounds of security.
The Labour MP for Luton South, Gavin Shuker, has questioned the Prime Minister over President Donald Trump's forthcoming visit to Britain.
Asking about the 2,000 children of immigrants locked up in cages in the United States, Mr Shuker asked Theresa May: "What does this man have to do to have the invitation she had extended revoked?"
Mrs May replied that the way the children were being treated was wrong but it was right to able to sit down and discuss issues with the President.