On GZERO World with Ian Bremmer, economist Larry Summers slams the Trump administration’s trade war as “the worst, most consequential, self-inflicted wound in US economic policy since the Second World War.” He says there’s still time to limit the damage—if the tariffs are walked back quickly—but warns that the global fallout is already underway. “Even in the best imaginable place, we have lost enormous credibility in the world,” Summers says, adding that the unpredictability rattles everything from debt markets to US alliances.