This key American business sector has a massive trade surplus with the rest of the world. Its jobs are at risk in a trade war.

While the White House is waging a trade war on behalf of US manufacturing, the largest and most important part of the US economy, one that has a trade surplus, not a gap, is under threat.

​ While the White House is waging a trade war on behalf of US manufacturing, the largest and most important part of the US economy, one that has a trade surplus, not a gap, is under threat. Read More Breaking News, Latest News and Videos | CNN