It's a sign of the increasingly different view Donald Trump and Emmanuel Macron have towards multilateral institutions.
Debating whether the United Kingdom should continue to defend its Western European allies, as it did throughout the 20 century, or take a more detached position, RT Howard in the Daily Telegraph argues "there is one compelling reason why our strategic ties with Western Europe now deserve to be closer than ever before".
Mr Macron said: "We have to protect ourselves with respect to China, Russia and even the US".
Trump, who has pushed North Atlantic Treaty Organisation allies to pay more for their common defense and not rely so heavily on the United States, complained.More news: Flight attendant breastfeeds stranger's baby on flight
"Very insulting", he added, "but perhaps Europe should first pay its fair share of North Atlantic Treaty Organisation, which the US subsidizes greatly!"
A coalition of ten European militaries ready to defend the continent's borders has been unveiled in Paris, just days after Emmanuel Macron called for a "real European army".
Trump's official mission on the trip is to participate in ceremonies marking the 100th anniversary of the end of World War One.
The relationship between Trump and Macron, once described as a "bromance", has long since soured amid the United States imposing steep tariffs on EU imports and threatening European businesses with secondary sanctions for dealing with Iran.More news: Umesh, Bumrah, Kuldeep rested for final T20I against WI
Trump's national security adviser, John Bolton, said on Friday in Paris that the USA was concerned about stability in Europe and that Trump was not shirking from global engagement.
Macron had made the remark Tuesday but Trump waited until he was in town to trash talk the French president.
Trump may also chat briefly with Russian President Vladimir Putin when both are among dozens of world leaders gathered at the Arc de Triomphe to mark the end of the Great War 100 years ago. That now seems more likely for later this month, when they attend the G20 summit of global leaders in Argentina.
Trump, who has pursued "America First" policies since taking over the presidency in January 2017, declared himself a "nationalist" during the run-up to the congressional elections, a term likely to raise concerns in Europe.More news: Saints fear Achilles tear for Bryant
"In exchange for the trade arrangements proposed and already flatly rejected by the European Union at Salzburg, the Chequers Proposals put the autonomy of Her Majesty's Armed Forces in jeopardy and risk compromising fatally our Five Eyes Intelligence alliance and especially our bi-lateral US-UK intelligence relationship", the authors write.