KEY POINTS
  • President Trump announced fresh sanctions on the Islamic Republic on Monday, following the downing of an unmanned American drone last week.
  • Iran responded to the additional sanctions by calling them "outrageous and idiotic" and suggested the White House was suffering from a "mental illness."
  • "That must mean that they are working if they are this upset about these sanctions," U.S. Treasury Secretary Steven Mnuchin tells CNBC.
  • Trump is willing to talk with Iran, but he's "also determined to enforce the U.S. and our allies' interests in the region," Mnuchin says.

U.S. Treasury Secretary Steven Mnuchin believes the latest round of economic sanctions against Iran must be working, citing the recent backlash from Tehran's leadership as proof.

President Donald Trump announced fresh sanctions on the Islamic Republic on Monday, following the downing of an unmanned American drone last week.