President Donald Trump announced new sanctions against Iran Monday in part to retaliate after the downing of a US drone last week, with the punitive measures targeting Iran's most senior leader, military officials and its top diplomat, Foreign Minister Javad Zarif. Speaking to reporters in the Oval Office, Trump said he signed an executive order imposing "hard hitting" sanctions on Iran that will deny Iran's Supreme Leader Ayatollah Ali Khamenei, his office "and many others" access to financial instruments.