If Trump pulls out of climate deal, US could join Syria and Nicaragua as nonparticipants

Trump said in a tweet that he would make his ‘‘final decision’’ this week.

"I will make my final decision on the Paris Accord next week!" the president wrote.

If the U.S. pulls out of the Paris deal, it would become the largest producer of greenhouse gas emissions not included in the agreement, according to EPA data.

Trump has at times seemed to downplay concerns over climate change.

"What a ridiculous situation," Trump said in the post.

Trump's chief economic adviser, Gary Cohn, told reporters at the G-7 summit Friday that the president was growing more attuned to the European stance on climate change.

"I think he is learning to understand the European position,” Cohn said when asked which way the president was leaning on the Paris agreement. “Look, as you know from the U.S., there's very strong views on both sides.”

“He came here to learn,” Cohn said at the summit. “So his views are evolving, which is exactly what they should be.”

ABC News' Jordyn Phelps and the Associated Press contributed to this report.