One night in Buenos Aires could define Donald Trump's presidency. Within a few hours, Trump telegraphed ambivalence about the two issues that have defined his time in politics: China and the wall.
Why it matters: Trump's comments mean the next three months may define his presidency. His first term is slipping away from him. On the trail, he promised to build a wall. But almost two years into his presidency, he's barely built anything. He also promised to force China to end its abuse of American businesses. But China hasn't changed in any meaningful way.