"This is a battle between good and evil".
Fresh off the U.S. President's abrasive scolding of North Atlantic Treaty Organisation leaders for not spending enough on defence, Mr. Trump was in no mood for compromise when he sat down with Mr. Trudeau and the leaders of Britain, Italy, Germany, Japan and France.
It was a similar story in Israel, where Prime Minister Benjamin Netanyahu warmly greeted Trump and the president reciprocated with emotional appearances at the Western Wall and Holocaust museum and suggested that there was an opening for peace with the Palestinians. The photo of his solemn visit to the Western Wall was splashed across the front pages of Israel's newspapers.
But he also expressed the hope of making peace between Israel and its Arab neighbors, and never declared his intention to move the USA embassy from Tel Aviv to Jerusalem - a move that would be certain to anger Palestinians, please Israel, and complicate peacemaking.
Trump boarded Air Force One without having held a single news conference on the trip - a break in presidential precedent that allowed him to avoid facing tough questions about his foreign policy or the raging controversies involving the investigations into his campaign's possible ties to Russian Federation.
The meeting's final declaration reflected a stalemate between the USA and the six other participating countries, who are all strongly committed to the Paris accord.
"We knew he was not going to make a decision at the G7" on climate, the French official said. "And the bottom line is that nations are spending more on defense now than they were five years ago or ten years ago".
By many accounts, President Trump made a strong showing in his first meeting with heads of state.
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Trump's visit to Saudi Arabia, the birthplace of Islam, gave Trump a chance to square US government policy with the vitriol of his campaign on Islam and terrorism.
Mr. Trump stood isolated at the G7 summit Friday, pushing back at intense efforts by Mr. Trudeau and fellow world leaders to persuade the U.S. President to back the 2015 Paris climate accord.
President Donald Trump looks at First lady Melania as he prepares to address USA military troops and their families at the Sigonella Naval Air Station, in Sigonella, Italy, Saturday, May 27, 2017. "Had great meetings on everything, especially on trade", Trump said on Twitter on Saturday, Efe news reported.
That platitude takes on more significance in the context of the G7 summit where Trump and the other six leaders diverged over free trade, climate change and migration policy behind closed doors.
James Comey, the former FBI director leading the Russian probe until Trump abruptly fired him, is still expected to testify before Congress about the memos he kept on conversations with the president that involved the investigation.
Those scandals continued to mount throughout his trip, and White House officials have remained largely silent on them, although aides took a few questions in media gaggles and conference calls. His top economic and national security advisers refused to answer questions during a press briefing Saturday.
When he was asked directly which way Trump was leaning on the deal, Cohn said "I don't know".
European Union nations are eager for a clear US pledge "to fight all forms of protectionism", said the diplomat, who declined to be named.