Uniformed police are very visible in Windsor this morning.
Thames Valley Police are handing out leaflets to locals and tourists who might find roads blocked or be subject to a check.
The leaflets provide details of counter-terrorism Project Servator, stating that the purpose of today's police operation is "designed to disrupt a range of criminal activity".
They also offer re-assurance, saying: “You can help by reporting anything that doesn’t feel right.”
While pageantry, pomp and fanfare will be at the centre of Trump's state visit to the UK, not everyone will be welcoming the US leader with open arms.
The Stop Trump Coalition - which comprises over 50 unions and charities - says they will stage a national demonstration against Trump's state visit today.
The group says they will gather in Portland Place at 14:00 BST, then march to Parliament Square and hold a rally at 17:00 BST.
Although Trump will not visit Parliament, which is currently in recess, groups say they will demonstrate to "defeat the politics of Trumpism" and to promote "an alternative, democratic vision of the world based on peace, social justice and international cooperation".
The Stop Trump Coalition says they want to "fight against the British government and political elite when it tries to appease" Trump's policies.
"A government that will bow down to Trump and to racism is one that will open the door to fascism," a spokesperson for the Stop Trump coalition said in a video posted on X.
Leader of the Green Party Zack Polanski, former Labour leader Jeremy Corbyn and Ben Jamal, the director of the Palestine Solidarity Campaign, will be speaking at the protest.
This protest also comes after the largest far-right march took place on Saturday.
Shortly after arriving at Winfield House in central London, Trump thanked the US ambassador to the UK Warren Stephens for "doing a great job".
Trump nominated Stephens, previously CEO of private investment bank Stephens Inc., to the highly-coveted post while still president-elect in 2024.
The former investment banker donated millions to Trump's re-election campaign last year.
Federal campaign finance data also show he also donated to Republican groups and US Senate candidates.
For President Trump’s previous state visit in 2019, Prince Andrew was one of the most visible royals, deployed to spend two of the three days of the visit escorting the president.
Prince Andrew, an old acquaintance of Trump, was seen then as an important person for looking after the US visitor.
This time round, with Prince Andrew now withdrawn from royal duties in the wake of his associations with Jeffrey Epstein, there will be no sight of him.
He won’t be a guest at the state banquet. He was at the funeral of the Duchess of Kent on Tuesday as it was a family event, but he won’t be invited to official occasions.
Even though Prince Andrew lives in Windsor, the nearest he’ll get to the state visit was when protesters projected a picture showing him with Epstein on to the Windsor Castle walls.(BBC)
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