Washington, June 25 -- US President Donald Trump on Monday signed an executive order imposing financial sanctions on Iran's supreme leader, the Ayatollah Ali Khamenei, in the wake of the Iranian downing of a US drone.

The sanctions "will deny the supreme leader and the supreme leader's office and those closely affiliated with him and the office, access to key financial resources and support," the President told reporters in the Oval Office before putting his signature to the document, the Efe news reported.

"Today's actions follow a series of aggressive behaviours by the Iranian regime in recent weeks, including shooting down of US drones," Trump said, flanked by Treasury Secretary Steve Mnuchin and Vice President Mike Pence.

"The suprem...