Iran’s economy will “crumble” under pressure from U.S. sanctions if the regime does not agree to a modified nuclear agreement that suits President Trump’s security requirements, Secretary of State Mike Pompeo warned on Monday.

“The Iranian regime has a choice: It can either do a 180-degree turn from its outlaw course of action and act like a normal country, or it can see its economy crumble,” Pompeo told reporters. “We hope a new agreement with Iran is possible, but until Iran makes changes in the 12 ways that I listed in May we will be relentless in exerting pressure on the regime.”