Sens. Rob Portman and Sherrod Brown hailed President Donald Trump’s decision Monday to designate North Korea a state of sponsor of terrorism, a move they both advocated last month.

In a statement after Trump’s announcement, Portman, R-Ohio, said “this designation will serve as an important tool to exert peaceful pressure on the North Korean regime.”

“North Korea was removed from the list nearly a decade ago with promises from the regime to limit their nuclear program,” Portman said. “That clearly hasn’t happened and they have continued their destabilizing actions in the region.”