Embed The code has been copied to your clipboard. No media source currently available 0:00 0:16:14 0:00 U.S. President Donald Trump's increased tariffs on all steel and aluminum imports took effect on Wednesday "with no exceptions or exemptions," escalating the global trade war. Trump's increased tariffs campaign to reorder global trade norms in favor of the U.S. drew swift retaliation. China, the EU, Canada and others have reacted to the with retaliatory tariffs of their own.