A group of five small businesses sued President Donald Trump on Monday, seeking to block new tariffs he has imposed on foreign imports in recent weeks. The lawsuit in the U.S. Court of International Trade alleges that Trump has illegally usurped Congress’ power to levy tariffs by claiming that trade deficits with other countries constitute an emergency. The Liberty Justice Center, which is representing the owner-operated companies, said Trump’s new tariffs of at least 10% on imports from most countries and higher rates for scores of other nations are devastating small businesses across the country. “His claimed emergency is a...