"He digested that. That was a meaningful moment to him", Cohn stated. "He came here to learn, he came here to get smarter".
Even without a formal decision on the Paris deal, Trump has moved to dismantle environmental policies seen critical for the U.S.to satisfy its pledge.
"Backing out of the Paris Agreement now, after the years of painstaking negotiations and strong USA leadership it took to get the world to this point, would be a self-inflicted injury to America's credibility and influence on the world stage", they wrote.
G7 nations had hoped the USA leader, who has previously described climate change as a "hoax", would publicly back the Paris Agreement and the commitment to cut greenhouse gas emissions. Almost 200 countries agreed to a United Nations deal in 2015.
And up for debate, the peril of climate change and the urgency of the US commitment to the Paris accord to reduce greenhouse gas emissions.
"We would seriously compromise America's global leadership and credibility if we were to pull out of the COP21 accords".
United States officials acknowledged they were expecting a hard discussion on trade after reports that Mr Trump had described the Germans as "bad, very bad" and vowed to stop them selling millions of cars in the USA, during a meeting with senior European Union officials in Brussels on Thursday. Kohn told reporters Wednesday evening that Trump "knows that Paris has important meaning to numerous European leaders".
The hot-button issues of climate change, trade and migration threaten to throw a summit of the Group of Seven wealthy democracies off its consensus game, with U.S. President Donald Trump cast as the spoiler-in-chief.
While Trump lectured some of the United States' strongest allies, he cozied up to the repressive government in Saudi Arabia while pushing for the Arab world to root out extremism at home.
Later on Thursday, Trump and leaders of other North Atlantic Treaty Organisation countries are set to meet for the first time to map out the future of the organization, and try to narrow their differences on its budget. Differences over trade and Russian Federation have also arisen in talks.
The gap between Trump and other G-7 leaders on climate underscored his isolation from Europe on some major issues.
Trump and other G7 leaders discussed the environment and Paris climate agreement for about 20 minutes during a meeting in Italy on Friday. White House adviser Ivanka Trump set up a review process to make sure her father received information from experts in both the public and private sector before making a decision on the agreement.
G7 leaders met on Friday (26 May) with divisions on trade and climate change, and fresh friction surrounding Donald Trump, threatening to undermine a show of unity against jihadist terrorism. The senators in the letter, including Mitch McConnell, Ted Cruz, and Rand Paul, said staying in the agreement would subject the U.S.to "significant litigation risk".
Global leaders taking part in the Group of Seven (G7) meeting this week are being called upon to brush aside the anti-science recalcitrance of the Trump administration and take the lead in addressing the crisis of climate change.
Pope Francis, who has framed climate change as an urgent moral crisis and blamed global warming on an unfair, fossil fuel-based industrial model that harms the poor, also appeared to be sending a message to Trump during their meeting.