The leaders from the world's major economies have arrived in Kananaskis, Alta., to participate in the G7 summit and discuss the world's most pressing issues. The ongoing trade war with the United States is top of the agenda for Prime Minister Mark Carney, but escalating conflicts in the Middle East, political tensions in the U.S. and other issues will also be addressed. University of the Fraser Valley political science professor Hamish Telford breaks down these world leader dynamics as we ask viewers what they're watching for in the G7 summit.