Squabbles erupted among G7 nations Saturday as their leaders gathered for an annual summit, exposing sharp differences on global trade tensions, Britain's exit from the EU and how to respond to the fires raging in the Amazon rainforest.

French President Emmanuel Macron, the summit host, planned the three-day meeting in the Atlantic seaside resort of Biarritz as a chance to unite a group of wealthy countries that has struggled in recent years to speak with one voice.

Macron set an agenda for the group — France, Britain, Canada, Germany, Italy, Japan and the United States — that included the defense of democracy, gender equality, education and the environment. He invited Asian, African and Latin American leaders to join them for a global push on these issues.