Iran is preparing a counter-proposal after rejecting the U.S. nuclear deal, prompting President Trump to caution that "time is running out."

The outline of the U.S. offer to Iran in their high-stakes negotiations over Tehran’s nuclear program is starting to become clearer.

As I prepared to take a photograph of an anti-American mural outside of the former U.S. Embassy in Iran’s capital recently, a passerby called out to me.