By Dietrich Knauth NEW YORK (Reuters) -Twelve U.S. states asked a federal court on Wednesday to halt President Donald Trump's "Liberation Day" tariffs, arguing that he overstepped his authority by declaring a national emergency to impose across-the-board taxes on imports from nations that sell more to the U.

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.