For months President Donald Trump has been slapping higher tariffs on practically every country’s exports to the United States, citing emergency economic powers.

U.S. appeals court judges sharply questioned on Thursday whether President Donald Trump's tariffs were justified by the president's emergency powers, as lawyers for states and businesses challenging the measures argued he exceeded his authority.

President Donald Trump may have gotten his way with tariffs on some countries, but his overhaul of American trade policy has not gone unchallenged