Israel and Iran have traded more missile attacks despite international calls for a halt to the fighting, with neither country showing signs of backing down as the conflict between the regional foes raged for a third day.

President Trump vetoed a plan presented by Israel to the U.S. to kill Iran’s Supreme Leader Ayatollah Ali Khamenei.

"The full strength and might of the U.S. Armed Forces will come down on you at levels never seen before," Trump warned.

Israel and Iran have opened a new chapter in their long history of conflict when Israel launched a major attack with strikes early Friday on Tehran.