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

Despite his promises to avoid foreign wars, Donald Trump now faces pressure at home and abroad to intervene as tensions between Israel and Iran spiral. The stakes could redefine his second term.