Iran has issued a stark warning to US President Donald Trump that it would treat any American attack as an “all-out war,” just a day after Trump announced a “big force” of warships was heading towards the violence-hit Middle East nation. Iran has issued a stark warning to US President Donald Trump that it would treat any American attack as an “all-out war,” just a day after Trump announced a “big force” of warships was heading towards the violence-hit Middle East nation.