"I think it's fine", Trump said.
It noted that numerous demonstrations are being planned for July 12 to 14, surrounding the visit of the President.
Asked about his views on the UK's plans for Brexit, Trump said: 'I would say Brexit is Brexit.
"And I said Putin may be the easiest of them all", he continued.
"I would say Brexit is Brexit, the people wanted to break it up so I would imagine this is what they will do".
"I am very strong with immigration, is a very important thing".
Trump will depart the North Atlantic Treaty Organisation summit in Brussels on Thursday afternoon local time and head to London for a greeting ceremony.
That business-friendly Brexit proposal was agreed by her cabinet only last Friday after two years of wrangling since Britons voted to leave the bloc in a 2016 referendum.
London Mayor Sadiq Khan, who signed off on the so-called "baby Trump" blimp, defended the decision Thursday, arguing the protests were not anti-American but emblematic of free speech.
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"But from the public, the welcome will be far from warm", he added, saying there would be protests across the country against Trump's "abysmal record on human rights, his repugnant attitude towards women and his disgusting treatment of minorities".
Russian Federation has strongly denied the charge.
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.
On Friday, Trump will meet May and her newly appointed Foreign Secretary Jeremy Hunt at the prime minister's countryside retreat, Chequers.
It is not a state visit, so the President will stay with the U.S. ambassador in London instead of being hosted by the Queen.
While she hopes the Trump visit will focus on trade and strengthening security ties, it is likely to be heavy on rhetoric about the transatlantic "special relationship" and short on specifics such as any details of a post-Brexit trade deal.
Mr and Mrs Trump will head to Scotland for the weekend, where they aren't expected to be involved in any official commitments.