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.

Twelve states have urged a federal court to annul President Trump's tariffs on imports, arguing they are unlawful and destabilizing to the economy. The legal battle challenges the application of emergency economic powers and highlights tension over U.

Ferguson formally endorsed an existing lawsuit filed by a coalition of states challenging the tariffs as illegal.