In London, Berlin, Brussels and Paris, European leaders are wondering how best to handle the USA president, whose nationalist "America First" agenda has upended transatlantic relations.
The two leaders will dine together at the Jules Verne restaurant up the Eiffel Tower, enjoying stunning views of the French capital along with their wives Melania and Brigitte.
"This is so handsome", Mr Trump said as he was met by Mr Macron at the Hotel des Invalides, near the site of Napoleon's tomb.
This year marks the 100th anniversary of the entry of American troops onto French soil and into World War I.
Trump will move to the U.S. Embassy on his arrival to the country on Thursday for a meet-and-greet with embassy staff and also with U.S. participants, who will be in the Bastille Day festivities on Friday.
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Macron and Trump enjoyed a similarly unusual handshake there, which seemed to be more a tug-of-war than pleasant exchange. When he announced his decision on the climate agreement, Trump said he was "elected to represent the citizens of Pittsburgh, not Paris".
Emails released on Tuesday suggest his eldest son welcomed Russian help against his father's Democratic rival Hillary Clinton.
"The meeting won't avoid subjects on which we have different positions, such as climate and, to a certain extent, trade", the Macron aide said. "It wasn't innocent", said Macron.
Officials said that Macron hopes to demonstrate to Trump the willingness of France to play a broader role in global security affairs.
About 11,000 policemen and military police will be deployed in Paris and surrounding areas on the eve of the French national holiday.
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Macron was one of Trump's fiercest critics.
During last year's Bastille Day celebrations, a 19-ton cargo truck deliberately ploughed into crowds in Nice, killing more than 80 people.
If the Brussels handshake, that was followed a day later by Macron's bodyswerve away from Trump at a lineup of leaders, defined the awkward start to their relationship, Thursday's welcome was created to show a newfound chemistry.
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