Though Trump later contradicted his comments by then promising a great USA trade deal, the president made clear his admiration for the 54-year-old Johnson, who Trump said would one day make a great British prime minister. "And I think she found it maybe too brutal".
"I would have done it much differently", Trump said.
Trump said Queen Elizabeth, 92, was a "fantastic woman", adding: "up close, you see she's so lovely. and she's got a lotta years left".
At Sandhurst, Britain's elite academy where military officers undergo training, Trump watched a display, travelling later in the now customary helicopter to Chequers, the prime minister's country retreat in Buckinghamshire where he and May held talks.
"If they do a deal like that, we would be dealing with the European Union instead of dealing with the United Kingdom, so it will probably kill the deal", Mr. Trump said in the interview.
Although only a few Tory MPs who have publicly called for Mrs May to step down, leading backbench Brexiteers such as Jacob Rees-Mogg and former leader Iain Duncan Smith have made clear they expect the prime minister to change her Chequers proposals to reflect their concerns.
BBC reporter Frankie McCamley posted footage on Twitter of Mr Trump, dressed in black and wearing a white cap, waving at protesters in the distance as they shouted "No Trump, No KKK, No Racist USA!"
Gareth Southgate 'incredibly proud' as England's World Cup adventure ends
Overall, it's not a surprise Belgium is favored, as it has looked like the better team in this tournament and has more talent. Petersburg, Sochi, Kazan, Saransk, Kaliningrad, Volgograd, Rostov-on-Don, Nizhny Novgorod, Yekaterinburg and Samara.
Young Duchesses Don Jenny Packham, Ralph Lauren at Wimbledon
Williams was at Markle and Harry's wedding on May 19, and recently told InStyle that she thinks Middleton is a "badass woman". She topped off the look with her hair in a middle-parted low bun with a few strands of wavy hair out to frame her face.
Trump criticises Obama over USA 2016 election hack
The charges include conspiracy to commit an offense against the US , aggravated identity theft and conspiracy to launder money. But top Democrats have urged him to cancel the planned summit altogether following the indictment.
Johnson, the face of the Brexit campaign for many has remained silent in public since he warned in his resignation letter on July 9 that the "Brexit dream" was being suffocated by needless self-doubt.
"I believe as commander in chief he has an obligation to address it and, frankly, put Putin and any other foreign nation that seeks to undermine our democracy on notice that the actions will not be tolerated", California Secretary of State Alex Padilla, a Democrat, said in an interview this week.
At a news conference with May, Trump repeated his belief that immigration had been "very bad for Europe" and for the United States.
Earlier this week two senior ministers resigned in protest at May's plans for trade with the European Union after Britain leaves the bloc next March.
President Trump also attacked the London mayor, Sadiq Khan, as protests took place in the capital and permission was given for a "Trump baby" blimp to be flown.
"And it enables us to build the new economic and security partnerships we want to see with the European Union".
The President said: "This incredible woman right here is doing a fantastic job, a great job".
A dozen demonstrators have staged a protest picnic on the beach in front of the Trump Turnberry golf resort in Scotland where President Donald Trump is spending the weekend with the first lady.