Trump administration officials, briefing reporters on Monday on the decision, said new economic sanctions against Iran were being prepared over its ballistic missile program and for contributing to regional tensions. The U.S. has certified with Congress that Iran is legally in compliance on the nuclear deal, but senior Trump administration officials said both Secretary of State Rex Tillerson and President Donald Trump will couch that certification with an accusation that Iran is “unquestionably in default of the spirit of the [agreement].”

Interested in Iran? WASHINGTON, July 18 (Reuters) - President Donald Trump's administration on Monday declared that Iran was complying with its nuclear agreement with world powers, but warned that Tehran was in default of the spirit of the accord and that Washington would look for ways to strengthen it. Even more puzzled that those partner nations however is Iran, whose Foreign Minister Javad Zarif was very public about how his government is having a heck of a time parsing the various mixed signals from the United States as any sort of coherent policy, let alone how to proscribe a policy for themselves that won’t lead to the US being furious at them. Add Interest

The officials pointed to “a range of malign activities” including Iran’s ballistic missile development, support of militant groups in the region and Syria's Assad regime, its hostility to Israel and its continued detention of foreigners including U.S. citizens.
The White House tells U.S. Congress that Iran is complying with its nuclear deal, and promises to impose new sanctions on Iran's ballistic missile program.