Trump imposes 'hard hitting' sanctions on Iran that could last years

Donald Trump has signed an executive order imposing "hard hitting" sanctions on Iran, as tensions between the US and the Middle Eastern country have escalated following an attack on an American surveillance drone.

The order would deny Iranian supreme leader Ali Khamenei and others access to financial instruments, with Mr Trump declaring the measure necessary to deny Iran access to nuclear weapons.

"We will continue to increase pressure on Tehran," Mr Trump said on Monday in the Oval Office. "Never can Iran have a nuclear weapon."

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