Larry Kudlow, the economic guru and former adviser to President Ronald Reagan, said President Donald Trump is right to pull the U.S. out of the 2015 global agreement to fight climate change. A key question is how the country will withdraw from the Paris Climate Accord.

“He could put it to the Senate. It was never ratified. It is a treaty which was never ratified,” Kudlow said on CNBC. “Also, the United States could take a six- or 12-month moratorium.”

Trump on Thursday said the U.S. would begin negotiations either to re-enter the Paris accord or to have a new agreement “on terms that are fair to the United States, its businesses, its workers, its people, its taxpayers. Trump also decried the treaty’s “draconian” financial and economic burdens. He said American withdrawal “represents a reassertion of American sovereignty.”

Kudlow said he’s against the idea of a government setting industrial policy