Japanese Prime Minister Shigeru Ishiba pushed back against Trump's agenda of levying higher tariffs on imported goods, arguing it would hurt economic growth. The Japanese leader specifically called Trump ahead of the summit to confirm their plans to talk on the sidelines, which is a greater focus for Japan than the summit itself.

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.

Russia was once in the exclusive club of major economies but was kicked out following its 2014 annexation of Crimea from Ukraine.