By Dietrich Knauth NEW YORK (Reuters) -Twelve U.S. states will ask 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.

Most companies, especially in the U.S. and China, say they will have to increase prices because of the Trump administration’s sweeping tariffs on dozens of imports, according to a new poll.