French diplomats had said beforehand that President Macron would use the meeting to try to convince President Trump to stick to a global deal to combat climate change.
At an earlier meeting with Belgian Prime Minister Charles Michel, Macron pressed Europeans to strengthen security cooperation after 22 people were killed in a suicide bombing in Manchester, England, on Monday. Macron added that he would be "demanding" in his exchanges with Putin.
With images of First Lady Melania appearing to brush him off as he tried to hold her hand at an airport in Tel Aviv fresh in the memory, Trump locked palms with French President Emmanuel Macron - for a really long time. The two leaders' knuckles went white during the handshake, according to observers, and Trump seemed to want to disengage first.
A similar photo-op during a meeting between Trump and German Chancellor Angela Merkel at the White House spurred some embarrassing worldwide headlines when the US President seemingly ignore repeated media prompts to shake the German leader's hand.
The incident also comes after Macron and Trump shared another power handshake on Thursday morning at the pair's first face-to-face meeting in Brussels.
Donald Trump is notorious for his painfully awkward handshakes - among other things - so it came of no surprise to witness his encounter with French president Emmanuel Macron. The record shows only favorable words from Trump for centrist Emmanuel Macron's opponent, the defeated far-right candidate Marine Le Pen. Quite literally, Trump likes to have the upper hand. Macron won the French presidency on May 7.
While terrorism may top President Donald Trump's agenda, European leaders keep pressing him on climate change and the environment.
"I have been very, very direct with Secretary (Jens) Stoltenberg and members of the alliance in saying that North Atlantic Treaty Organisation members must finally contribute their fair share and meet their financial obligations", Trump said.
The march is set for Saturday afternoon, as leaders of the world's seven largest democratic economies wrap up their two-day summit. Declining to do so is significant as Trump has threatened to remove the United States from the alliance, which was formed in 1949.