Donald Trump addresses the United States amid showdown with Iran

Donald Trump is facing a move from concerned politicians who will vote to limit the US President's power to take military action against Iran.

US President Donald Trump faces one of the greatest tests of his presidency after Iran launched ballistic missiles at Iraqi bases housing US troops.

Iran struck back at the United States early Wednesday for killing its most powerful military commander, firing a barrage of ballistic missiles at two Iraqi military bases that house American troops in what the Iranian supreme leader said was a “slap” against the US military presence in the region.