President Donald Trump may have found a place where he can embrace renewable energy: on his proposed border wall.

Less than a week after pulling the U.S. out of the Paris climate agreement, Trump told congressional leaders he is exploring the idea of attaching solar panels to a wall he wants to build along the southern border, House Majority Leader Kevin McCarthy and House Majority Whip Steve Scalise confirmed to reporters.

“He did talk about it,” McCarthy said Tuesday night.

Asked about reports Trump said the wall would be 50 feet tall, McCarthy said, “They said there was — that they’ve been studying it, they have different people coming in. So it could be at different heights.”

Building a wall along the U.S.-Mexico border was a staple of Trump rallies throughout the 2016 campaign.