US President Donald Trump will make an unprecedented second state visit to the UK in September.
Trump, who will be accompanied by his wife Melania, was hosted by the late Queen Elizabeth II in June 2019.
A state visit is a formal trip to the UK by the head of a country. They are usually arranged at the invitation of the monarch, acting on government advice.
As well as being grand occasions with lots of pageantry, governments use the visits to further Britain's interests.
Traditionally, US presidents serving a second term - such as Trump - are not offered a state visit. Instead, they are invited for tea or lunch with the monarch, as happened with former presidents Barack Obama and George W Bush.
