U.S. President Donald Trump is forecasting an unspecified "escalation" between the U.S. and Iran.
Trump also says Iran is treating the U.S. with more respect, though there is no evidence to support Trump's claim.
Trump withdrew the U.S from the Iran nuclear deal earlier this year, reinstating economic sanctions that had been lifted under a deal among Iran, the U.S. and other world powers in exchange for curbs on Iran's nuclear program.
Trump was asked about Iran at a news conference in Brussels, where he wrapped up his participation in a NATO summit.
He says Iran is feeling a lot of pain as a result and that at some point Iran will "call me and they're going to say let's make a deal, and we'll make a deal."
U.S. Secretary of State Mike Pompeo on Thursday called on American allies to help impose economic pressure on Iran, and accused Tehran of continuing to sell weapons in the Middle East despite United Nations resolutions.
"We must cut off all funding the regime uses to fund terrorism & proxy wars," Pompeo said in a Twitter post ahead of his scheduled meeting with European Union's foreign affairs and security policy representative Federica Mogherini in Brussels.