LONDON − British police say they have planned for "just about every foreseeable eventuality" ahead of President Donald Trump's state visit.

Trump arrives in Britain on Sept. 16 for his unprecedented second state visit. It starts the next day, when he will be treated to the customary display of royal pageantry at Windsor Castle, including a carriage tour and a lavish banquet.

"This is a significant policing and security operation, as would be expected for a state visit of the president of the United States," Assistant Chief Constable Christian Bunt of the Thames Valley Police told reporters.

More: King Charles to host Trump in September for state visit, Buckingham Palace says

The royal part of Trump's visit will be held at Windsor Castle to the west of London, the oldest and largest inhabited castle in the world. It has been a family home to British monarchs for almost 1,000 years.