President Trump delivers remarks before signing tariff proclamations on steel and aluminum imports at the White House on March 8. Treasury Secretary Steven Mnuchin (second from left), Commerce Secretary Wilbur Ross, U.S. Trade Representative Robert Lighthizer and White House National Trade Council Director Peter Navarro look on.

President Trump delivers remarks before signing tariff proclamations on steel and aluminum imports at the White House on March 8. Treasury Secretary Steven Mnuchin (second from left), Commerce Secretary Wilbur Ross, U.S. Trade Representative Robert Lighthizer and White House National Trade Council Director Peter Navarro look on.