FILE PHOTO: U.S. President Donald Trump gives out pens he used to sign presidential proclamations placing tariffs on steel and aluminum imports to workers from the steel and aluminum industries at the White House in Washington, U.S. March 8, 2018. REUTERS/Leah Millis/File Photo
FILE PHOTO: U.S. President Donald Trump signs a presidential proclamation
FILE PHOTO: U.S. President Donald Trump signs a presidential proclamation placing tariffs on steel and aluminum imports while surrounded by workers from the steel and aluminum industries at the White House in Washington