Economist Jeffrey Sachs warns Trump’s trade war could become real war

The leaders of the G20 richest nations are heading to Japan for a summit on Friday. But what’s up for discussion is something of a moot point. The very mention of the dangers of trade wars and protectionism in the draft text has angered America, which is in the middle of a trade stand-off with China.

We have been speaking to one of the world’s most famous economists, Jeffrey Sachs, who says President Trump is the world’s biggest threat, and warns that a trade war can all too often lead to a real war.