As tensions rise after Israeli airstrikes on Iran's nuclear sites, Prime Minister Netanyahu accused Iran of plotting against the U.S. president.

It’s a tableau no world leader — except perhaps President Donald Trump — wants to repeat. Convening in the Canadian Rockies for this week’s Group of 7 summit, presidents and prime ministers are hoping to avoid the acrimony that pervaded the last time this country played host to the world’s most exclusive club.

The president had opposed Israeli action against Iran but came to believe that Israel had reason to act and that the U.S. would have to lend some support.

The U.S. president faces pushback over the risk of U.S. involvement in the escalating conflict between Israel and Iran.

President Donald Trump said the United will come down on Iran “at levels never seen before” if the Middle Eastern country attacks.

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

A Democratic senator introduced legislation on Monday to prevent U.S. President Donald Trump from using military force against Iran without Congress's authorization, as an escalating battle between Israel and Iran raised fears of broader conflict.

President Donald Trump vetoed a plan presented to the U.S. in recent days to kill Iranian supreme leader Ayatollah Ali Khamenei, according to a U.S. official familiar with the matter.