US President Donald Trump will arrive in the UK on Monday morning for a three-day official state visit, the BBC reports.
Air Force One is expected to land at London Stansted Airport at 09:00 BST.
Mr Trump will meet members of the Royal Family, and is expected to discuss climate change and Chinese technology firm Huawei during talks with outgoing Prime Minister Theresa May.
Protests are planned across the UK during the visit, including in London, Manchester, Belfast, and Birmingham.
Although Mr Trump has spoken of his admiration for Mrs May, there is expected to be differences of opinion during their talks, which begin on Tuesday.
The prime minister will raise the issue of climate change, with a government spokesman again saying on Monday the UK was "disappointed by the US decision to withdraw from the Paris Agreement in 2017".
The two leaders are also expected to discuss Huawei. The US has blacklisted the Chinese firm for security reasons, while the UK may allow it to supply "non-core" components for its 5G network.