A range of sanctions are up for negotiation if the U.S. achieves “a substantial step” towards denuclearization through the summit between President Donald Trump and North Korean leader Kim Jong Un in Vietnam this week, Secretary of State Mike Pompeo said in an interview Sunday.

Speaking in an interview with CNN's Jake Tapper, Pompeo insisted that “the core economic sanctions, the sanctions that prevent countries from conducting trade, creating wealth for North Korea, those sanctions are definitely going to remain in place” until complete denuclearization.