Leaders of the world's largest economies have gathered in France for the G7 summit, facing significant diplomatic friction between American and European officials.

The G7 gathering of leaders of the world's biggest economies gets under way in France on Monday, at a time of strain between Europe and the U.S. <p>The G7 gathering of leaders of the world's biggest economies gets under way in France on Monday, at a time of strain between Europe and the U.S.</p><img src="https://media.npr.org/include/images/tracking/npr-rss-pixel.png?story=nx-s1-5856340" />