President Donald Trump is waging a trade war without getting approval from Congress: He declared a national emergency to slap import taxes — tariffs — on almost every country on earth.

By Dietrich Knauth, Blake Brittain NEW YORK (Reuters) -Five American small businesses asked a U.S. court on Tuesday to halt President Donald Trump's "Liberation Day" tariffs, arguing that he overstepped his powers by declaring a national emergency to impose across-the-board taxes on imports from nations that sell more to the United States than they buy.

In an obscure courthouse in downtown Manhattan, a group of small businesses are taking on one of President Donald Trump's boldest uses of executive authority.