Mr Trump will then rejoin Melania, who is being hosted by Mrs May's husband Philip on a separate schedule that morning, for their visit to meet the Queen at Windsor.
"Trump's visit is an important moment to recognise our close relationship", the spokeswoman said.
That evening he will attend a black-tie dinner with business leaders at Blenheim Palace, a grand country house near Oxford that was the birthplace of Winston Churchill.
They will then travel to Chequers, May's country residence, for talks on a range of foreign policy issues.
Most recently, the separation of migrant children and parents at the US-Mexico border reignited calls for May to call off Trump's visit.
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The Trump administration contends that China has deployed predatory tactics in a push to overtake US technological dominance. He also upped his threat to go further - saying he'd target up to US$500 billion of Chinese goods if they retaliate.
Johnson said Trump was "aware" of the planned protest, which will also feature a six-metre (19-foot) high balloon showing the president wearing a nappy.
Trump arrives in Britain on Thursday after a North Atlantic Treaty Organisation summit in Belgium that could turn contentious over the US leader's insistence that allies pay more for their defence and amid trade disputes between Washington and Europe.
"For a United States president who retweets far-right Britain First propaganda, insults Londoners at times of tragedy, and refuses to condemn white supremacist marches at home, this insult is well deserved" said Labour MP David Lammy.
Thousands are expected to protest in London on Thursday and Friday against the president's working visit.
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Their team had just reached a World Cup quarterfinal for the first time in 24 years, and they were going to enjoy the moment. The Swiss certainly weren't playing like a team ranked sixth the world and with only one loss in their previous 25 games.
A spokeswoman for British Prime Minister Theresa May denied to The Guardian that the prime minister's use of the Chequers retreat to meet with Trump was designed specifically to help the president avoid major protests. In January, Mr. Trump abruptly called off a planned visit to London because he wasn't happy with the deal the US made to move its embassy in the city.
"The president is not avoiding anything", the ambassador said.
It is expected meeting the Queen will be the last of Trump's official duties before he jets off to Scotland, where he owns two golf properties. "We're looking forward to making sure the president has a chance to see and experience the United Kingdom beyond London and the south-east". But the US President will spend hardly any time in London, minimizing the risk of awkward encounters with angry protesters.
The visit comes at a testing time: May is battling to make a success of Brexit and keep her minority government together, while Trump is challenging Western assumptions about free trade and turning away from global institutions.
On the final leg of the tour, the couple will fly to Scotland, where they plan to spend the weekend.
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Four police officers - one with a small set of ladders - watched him as he entertained the crowd and finally helped him down. I don't know how that was even possible but he had hold of my ribs. "I was so upset, I felt quite deflated".
They added that Trump Baby "can become a permanent feature of this awful Presidency, a constant, unmissable reminder of the contempt with which this embarrassment of a man is held by everyone outside of his deranged, bigoted base".