Donald Trump has arrived in Britain tonight for his historic second state visit where he will spend time with his 'friend' King Charles III.

The US President, 79, landed at Stansted Airport on Air Force One and held First Lady Melania's hand as he walked down the aircraft steps.

Melania sported a trench coat from British designer Burberry and black riding boots as she and her husband were greeted by the Viscount Hood, Lord-in-Waiting, on behalf of King Charles.

Foreign Secretary Yvette Cooper, who opposed his first state visit, shook Trump's hand for about five seconds.

The Maga leader and his 55-year-old wife Melania were flown by his Marine One helicopter to the US ambassador's residence Winfield House in Regent's Park, London, where they will stay tonight.

On board Air Force One, Trump gushed about the expected pageantry awaiting him.

'Enjoy yourselves. You're going to have some great pictures today,' he told reporters. 'It's going to be a beautiful event. Everyone's looking forward to it. And we'll just relax and have a good time.'

Trump earlier boasted about heading to the UK and spoke of his excitement to see the 76-year-old monarch, whom he described as 'an elegant gentleman'.

'My relationship is very good with the UK, and Charles, as you know, who's now King, is my friend,' he said ahead of boarding Air Force One at Joint Base Andrews in Maryland.

'It's the first time this has ever happened where somebody was honoured twice. So, it's a great honour.

'And this one's at Windsor. They've never used Windsor Castle for this before. They use Buckingham Palace.

'And I don't want to say one's better than the other, but they say Windsor Castle is the ultimate, right? So it's going to be nice.'

Trump is staying at Windsor Castle as Buckingham Palace is currently undergoing a £369million refurbishment, which isn't due for completion until 2027.

French President Emmanuel Macron and his wife Brigitte also stayed at Windsor Castle during their three-day state visit in July.

Tiffany Trump, the president's daughter with Marla Maples, and her husband Michael Boulos joined the president and first lady on Air Force One.

Trump said earlier today ahead of the trip: 'Primarily it's to be with Prince Charles and Camilla. They're friends of mine for a long time, long before he was King, and it's an honour to have this King.

The Trumps exit Air Force One after arriving at Stansted Airport. Melania was wearing a trench coat from British designer Burberry

'And, you know, I think he represents the country so well. He's such an elegant gentleman and he represents the country so well.'

Trump will enjoy a royal flypast, a carriage ride with Princess Kate and a grand state banquet among other meetings during his stay.

Tonight protestors gathered outside Windsor Castle and held placards reading 'go away, you're polluting Windsor', and 'fascists not welcome'.

One group could be heard chanting: 'Say it loud, say it clear, Donald Trump’s not welcome here.'

Some Maga faithful were also seen outside the castle grounds waving an American flag, while another held a RIP Charlie Kirk sign.

Meanwhile, two men have been arrested by police on suspicion of flying a drone over Windsor.

A 37-year-old suspect from Aylesbury, Buckinghamshire, is in custody after allegedly breaching temporary air restrictions brought in from today as part of the massive police safety operation required for the US President's short stay in the UK.

Thames Valley Police said the man was flying a drone in the village of Datchet, not far from Windsor Castle.

It comes hours after another 37-year-old man, from Brentford in west London, was arrested on suspicion of flying a drone over Windsor Great Park.

Trump described the second state visit to the UK as a 'great honour' and said that he is looking forward to talking to his 'friend', the King.

The President's allies also vowed he would 'go easy' on struggling Sir Keir Starmer following a series of domestic hits to the Prime Minister's leadership.

Labour had feared Trump could use the visit to lambast the PM over freedom of speech in the UK, amid claims from conservatives that the Online Safety Bill impinges on the rights of Americans.

But sources today said the president could go easy on Sir Keir due to the significant domestic pressure he is under.

US President Donald Trump and First Lady Melania Trump will meet King Charles and Queen Camilla during their state visit this week (they are all pictured here in 2019)

One said: 'This trip will be about the splendour of Windsor Castle, inspecting the troops, the big banquet. This is a big deal for him. And the plan is to keep it about that.'

Yet despite a series of political scandals, with Lord Mandelson being dismissed as US ambassador and ex-Deputy Prime Minister Angela Rayner resigning over underpaid stamp duty, Trump praised the PM saying he represents the UK 'so well'.

The American leader is being feted with a stay in Windsor Castle where he will be hosted by the King and treated to a ceremonial welcome on Wednesday and a lavish state banquet.

Security will be paramount, with Mr Trump confined to the private Windsor estate on the first full day, before heading to the Prime Minister's country residence Chequers on Thursday.