USA president Donald Trump echoed the words of United Kingdom prime minister Boris Johnson by saying that Britain's National Health Service (NHS) is not part of any potential trade deal between the two nations.
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".
Concern had been expressed by senior members of the Conservative Party that they could suffer in the polls if the controversial American weighed in or commented on issues surrounding the General Election.
Corbyn claims US firms are seeking to exploit Britain's state-run National Health Service (NHS) in any UK-US trade deal London signs after leaving the European Union.
"I'm going to be photographed with every possible leader", he insisted, and later posed with the president for an official welcome alongside North Atlantic Treaty Organisation chief Jens Stoltenberg.
On Tuesday, Trump praised Johnson as "very capable", but largely avoided commenting on the United Kingdom election. During a press conference this morning in London, President Trump rebuked these suggestions, insisting he had no idea "where that rumour started".
"On Huawei and 5G, I don't want this country to be unnecessarily hostile to investment from overseas", Johnson told reporters.
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"I do think it's a security risk, it's a security danger", Trump said.
With just nine days of General Election campaigning to go, the Prime Minister was given the brush off during a visit to Salisbury when an Army veteran pointed out he had dandruff. "I called it the day before", he said.
"I think Boris is very capable and I think he'll do a good job", Trump said in London, where he is attending a meeting of North Atlantic Treaty Organisation leaders.
However, Mr Johnson said the claims were "nonsense" and the NHS would not be part of any such trade discussions.
They said it could signal foreign interference in Britain's election.
The Tories said Labour's claim it would reduce living costs "defies belief", while accusing the party of standing on a manifesto containing tax hikes for "ordinary hardworking people".
Asked what he would say to Mr Trump over security matters and Nato, Mr Corbyn said: "That we need to live in a world of peace, we need to live in a world that includes dialogue and we need to improve the dialogue with Russian Federation whilst at the same time being critical of their human rights record".