Trump says tariffs are needed to protect vital industries, but are they?

The Navy's new USS Little Rock arrives at the harbor in Buffalo, N.Y., last December. In imposing tariffs on steel and aluminum imports, President Trump said the U.S. military should be as self-sufficient as possible.
The Navy's new USS Little Rock arrives at the harbor in Buffalo, N.Y., last December. In imposing tariffs on steel and aluminum imports, President Trump said the U.S. military should be as self-sufficient as possible.