Trump vows to hit Iran 'hard' after first exchange of fire in weeks

US President Donald Trump threatened on Monday to hit Iran "hard" after the two foes traded fire for the first time in weeks, as his Treasury secretary vowed to keep up a pressure campaign aimed at hobbling Tehran's economy. After six months of war, the foes remain at an impasse, with Iran keeping the strategic Strait of Hormuz closed and the US persisting with a counter-blockade of Iranian ports.