US 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.
In a breakfast meeting with Nato Secretary General Jens Stoltenberg at the U.S. ambassador's residence in London, Mr Trump was asked if the NHS should be on the table in trade talks.
The NHS has been in the spotlight over the last month, after the leader of Britain's main opposition party Labour - Jeremy Corbyn - claimed he had "proof" the NHS was at risk under a post-Brexit UK-US trade deal.
The president is scheduled to have breakfast with Jens Stoltenberg, the secretary general of North Atlantic Treaty Organisation, on Tuesday morning.
He described Johnson as "very capable" and said "he will do a good job".
Mr Johnson is set to issue a new appeal for unity, following a spat between Mr Macron and Mr Trump, which saw the president branding his French counterpart "very nasty" for calling North Atlantic Treaty Organisation "brain dead".
Pressed if he is sure of the source from which Labour got the documents, he said: "Those documents represent meetings that took place between a British minister and officials in the U.S. and a lot more meetings that took place between British officials and United States officials to discuss how they would open up our public services to American corporations".
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"Our NHS (National Health Service) will not be put up for sale to anybody".
Asked if he could work with Corbyn, Trump said: "I can work with anybody, I'm a very easy person to work with".
However, Mr Johnson said the claims were "nonsense" and the NHS would not be part of any such trade discussions.
The Labour leader has also dismissed the PM's stinging criticism of his security record in which he accused Mr Corbyn of siding with "our enemies".
The US president has previously criticised Corbyn as "bad" for Britain, but he declined to repeat this on Tuesday.
Party leader Jo Swinson called on the Prime Minister to make sure discussions on the sidelines of the North Atlantic Treaty Organisation summit in London make clear the United Kingdom will maintain its food standards.
"I am sure you understand that our coming General Election on 12th December means the British public need urgent clarity that our NHS is genuinely off the table in UK-US trade talks and will not be exposed to higher costs from US drugs companies", Corbyn wrote in the letter, released by his office.