Leaders of some of the world’s biggest economic powers arrive in the Canadian Rockies for a Group of Seven summit that's been shadowed by an escalating conflict between Israel and Iran and U.S.

The 2018 summit ended with Trump assailing his Canadian hosts on social media as he departed on Air Force One, saying he had instructed the U.S. officials who remained in Quebec to oppose the G7 joint statement endorsed by the leaders of Japan, France, the United Kingdom, Italy, Germany and, of course, Canada.

President Trump is in Canada Monday for the G7 summit, as his aides will be negotiating with those same allied nations over the tariffs he's imposed . The summit, which is taking place just outside of Calgary,