In slapping duties on steel and aluminum nearly seven years ago, Trump reached into the federal government’s tariff toolkit and pulled out Section 232 of the Trade Expansion Act of 1962. Section 232 gives the president the power to impose tariffs on other countries national security grounds.

This is the beginning of making America rich again,’ president says.

Stocks in Asia were mostly down Tuesday, after U.S. President Donald Trump imposed 25% tariffs on all U.S. imports of steel and aluminum