At the Group of 7 summit in France, President Trump seemed determined to prove that he can wage a trade war with China without hurting the economy. But there are already signs of distress. Guest: Peter S. Goodman, an economics correspondent for The New York Times. For more information on today’s episode, visit nytimes.com/thedaily.  Background coverage: President Trump can confront China or expand the economy, but he can’t do both at the same time, our economics correspondent writes in a news analysis.Mr. Trump shifted his tone on the trade war yet again on Monday, calling President Xi Jinping of China a “great leader” three days after branding him an “enemy.”