President Donald Trump is attending the opening day of the Group of Seven summit Monday in Canada, where some of the staunchest and oldest U.S. allies are expected to discuss tariffs and the escalating military conflict between Israel and Iran — all while attempting to avoid direct confrontations with the mercurial U.

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

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.

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.

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

Discussing the conflict between Israel and Iran, the former vice president said Trump "ought to be looking elsewhere than Vladimir Putin for advice."

President Donald Trump is urging Iran to make a nuclear deal now that Israel has launched strikes against the country.