U.S. President Donald Trump leaves on Monday for a North Atlantic Treaty Organisation summit in London and he is under pressure from British Prime Minister Boris Johnson to resist the temptation to wade into the British election campaign coming up later in December.
Johnson made the comments during a radio interview on LBC.
Trump is in town for a summit marking 70 years of the North Atlantic Treaty Organisation military alliance, but his presence risks disrupting the campaign for the December 12 vote as it enters the final straight.
Mr Trump is due in the United Kingdom next week to join world leaders for a North Atlantic Treaty Organisation summit.
Pressed further, the official added: "He also, as I suspect you know, likes Boris Johnson - Prime Minister Johnson, personally". The President expressed his condolences following the terrorist attack in London.
However, Johnson said he would walk out of trade negotiations if including the health service was a pre-condition. On the eve of the British election, though, Trump wasn't circumspect, saying Corbyn "would be so bad" for Britain and describing his " friend" Boris Johnson as "the exact right guy for the times".
Labour recently published a 451-page package of allegedly leaked government documents showing that the Conservative Cabinet under Prime Minister Theresa May had purportedly negotiated the "sale" of the NHS to the US.
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Labour's Corbyn has said Johnson will sell off parts of Britain's widely cherished health service to USA businesses after Brexit, which Johnson has denied. They also objected to the overall prices Britain's NHS pays for USA pharmaceuticals.
Mr Trump did have some criticism for Mr Johnson's Brexit deal, claiming it hinders trade with the US.
At the other end of the political spectrum, Brexit Party leader Nigel Farage, a Trump ally and friend, is also hoping Trump's visit will benefit him and give a lift to his flagging electoral prospects.
During the program, which was on the eve of the official election campaign, Trump agreed with Farage, who wants a clean break from the European Union, that Johnson's withdrawal agreement would make a trade agreement with the US impossible.
When asked if he was going to have more children, Johnson, 55, who is living at Downing Street with his partner Carrie Symonds after separating from his wife a year ago, said: "I'm not going to get into discussions (on this)".
"It had been crass and it was primitive and it was wrong - men state terrible things occasionally", he explained, referring comments in which the USA president said he'd" grab" women by their own genitals with no consent.