WASHINGTON — With top presidential aides stubbornly divided, the White House abruptly announced on Tuesday that President Trump would make no decision on the United States’ future in the Paris climate change accord until June, after he returns from a meeting of the Group of 7 Western powers.

The announcement by the White House press secretary, Sean Spicer, encouraged advocates of the landmark climate pact, who hope that Mr. Trump’s fellow heads of state can pressure the president to remain in the accord, first at a NATO summit meeting in Brussels next week and then at the G-7 meeting in Taormina, Italy. Similar pressure was brought to bear by the leaders of Mexico and Canada when Mr. Trump threatened to withdraw from the North American Free Trade Agreement — then reversed course.

As Mr. Trump embarks on his first foreign trip since assuming office, heads of state are expected to point out to him that withdrawing from the deal is likely to affect his standing and credibility on the world stage as he seeks to press other elements of his foreign policy agenda, such as trade and military efforts to suppress the Islamic State.

“All the European governments hope that President Trump will stay in the Paris Agreement, and the G-7 can be the moment where he can measure the diplomatic cost of the pulling out,” said Laurence Tubiana, the lead French climate negotiator of the 2015 accord. “It will be a fantastic opportunity to make that case.”