Both those accords were the result of years of painstaking diplomacy by European leaders, and Trump unilaterally trashed them.
But, he added: "Whether he sees it, whether he reacts to it, we don't really care".
For no apparent reason, he chose to go on the attack against Prime Minister Theresa May, London Mayor Sadiq Khan, and the nation's immigrants - showing that his bigotry crosses borders.
But it's not simply the protesters, who are expected to dog Mr. Trump throughout his visit, including his weekend in Scotland, but his fraught relationship with political leaders accustomed to harmonious exchanges with US leaders, a tradition of unity that goes back at least to the vital World War II partnership of Franklin D. Roosevelt and Winston Churchill.
British Prime Minster Theresa May and U.S. President Donald Trump walk across the courtyard at Blenheim Palace, where they are attending a dinner with specially invited guests and business leaders, near Oxford, Britain, July 12, 2018. "With a lot of resignations", Trump told a news conference at the North Atlantic Treaty Organisation summit in Brussels.
The monarch regularly meets Presidents of the United States and their spouses at Windsor Castle, including Barack and Michelle Obama, George W. Bush and Laura Bush, and Ronald and Nancy Reagan. "I think it changed the fabric of Europe and, unless you act very quickly, it's never going to be what it was and I don't mean that in a positive way".
Organisers said they will transport the balloon to Scotland overnight, and will now fly it elsewhere on Saturday.
"I've been reading a lot about Brexit over the last couple of days and it seems to be turning a little bit differently where they're getting at least partially involved back with the European Union", he told reporters.
President Trump is scheduled to meet British Prime Minister Theresa May, who wants a post-Brexit trade deal, days after President Trump said the United Kingdom was in "turmoil". I think that " s why Brexit happened".
"We had an opportunity to have an exchange about economic developments, on issues such as migration, and also the future of our trade relations", she said, after a tete-a-tete on Trump's anti-EU trade war. "They like me a lot in the UK".
On Thursday night, hundreds of demonstrators chanted outside the US ambassador's residence where Trump was staying on the outskirts of London, providing a preview of the forceful protests expected on Friday.
One woman who saw the President arrive said he had given a "short speech" which she described as "lovely". Organizers have been given permission to float a giant balloon depicting Mr. Trump as a baby and they've already declared victory by noting that the President is largely avoiding London during his visit.
Mr Trump flew into Stansted before being taken by military helicopter escort to the Ambassador's residence Winfield House in Regents Park where he stay the night before going to the dinner.
May has had to defend Trump's visit in the face of fiery criticism from opposition lawmakers.
Trump is due to leave Britain on Sunday for talks in Helsinki the following day with Russian President Vladimir Putin, whose government stands accused by May's of unleashing a lethal nerve agent in the city of Salisbury.
In walks President Trump, to call out one of the claims that Number 10 has been making of late - in essence, smashing the vase to bits.
Instead, what had been an state visit was downgraded to a working visit, which means the Queen does not officially host the president and the first lady as she has done with previous US presidents.