President Trump is still thinking through the arguments as he decides whether the United States should withdraw from the Paris climate agreement, senior administration officials said Friday.

"I think his views are evolving," White House national economic council director Gary Cohn told reporters in Sicily. "And he came here to learn and he came here to get smarter."

"The president is thinking about what his options are and is taking in what he learned from world leaders today," Cohn said. "If he were standing here, he would tell you he feels much more knowledgable on the topic today, even though I think he's very very knowledgable in talking with leaders and having an exchange with many leaders today that have been talking about this topic for years."

Trump, who has been on a foreign swing as president, is in Sicily on Friday and Saturday for the G7 summit. The White House has said Trump won't announce his decision on the Paris Agreement until after the summit.

"The one thing I'll say that won't change though is he's certain to base his decision based on what he thinks is best for the American people," national security adviser H.R. McMaster said. "So while his views are evolving, the basis for his decision remains unchanged."

The other G7 countries support the Paris Agreement. Trump campaigned on withdrawing during the presidential race. He now says he hasn't made up his mind. His administration is divided in roughly three camps on the issue.

Trump is facing pressure from folks back home. More than 20 Republican senators, including Senate Majority Leader Mitch McConnell, sent a letter Thursday to Trump asking him to leave the agreement, arguing it would subject the country to a "significant litigation risk" and make it more difficult to rescind the Clean Power Plan.