US President Donald Trump has claimed he has left standing orders for the US military to unleash massive retaliation against Iran if Tehran follows through on what he described as long-standing assassination threats against him.

President Trump revealed he has left instructions for the US to respond with significant military action against Iran if they attempt to assassinate him.

Donald Trump has made yet another grim reference to his death, detailing the instructions he has handed down to aides in the event he is assassinated.