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.

Small business owners said that the 90-day trade deal with China isn't long enough to place shipments confidently, and "just kind of terrifies me."

Following Walmart’s decision to hike prices due to the U.S. tariffs on China, President Donald Trump took to social media to slam the company. The full effects of the Trump administration’s tariffs on U.