President Donald Trump said he would be increasing tariffs on steel and aluminum to 50% from 25%, saying the move would help protect American workers, as he visited a United States Steel Corp. plant on Friday.

By Jeff Mason, Alexandra Alper and Trevor Hunnicutt WEST MIFFLIN, Pennsylvania (Reuters) -U.S. President Donald Trump on Friday lauded an "agreement" between Nippon Steel and U.S. Steel at a political rally but stopped short of clarifying whether he planned to approve the companies' diplomatically sensitive merger.