After filing an initial lawsuit last month, the American Institute for International Steel (AIIS) filed a motion for summary judgment this week in a bid to halt the enforcement of a 25 percent tariff on imported steel that was announced earlier this year by President Trump.

statement released by the White House cited President Trump's authority under Section 232 of the Trade Expansion Act to "address any threats to national security by restricting imports through tariffs." AIIS' lawsuit argues that this power is being used unconstitutionally. 

“Section 232 of the Trade Expansion Act allows the president nearly unfettered discretion to impose tariffs and create other trade barriers if he simply decides that imports threaten to impair U.S. national security,” said AIIS president Richard Chriss in a release announcing the motion. “At the same time, the law allows tremendous latitude to the president in determining what constitutes a threat. The United States Constitution provides important checks on the president’s power, and the Section 232 trade provision stands in clear violation of that balance.”

Since the enactment of the 25 percent tariff on imported steel, AIIS reported a sharp disruption in the U.S. steel supply chain industry, including a newfound difficulty in obtaining specific types of steel, imported or sourced domestically. "To date, U.S. Customs and Border Protection has collected in excess of $582 million in tariffs — amounting to a tax imposed on the U.S. economy," according to AIIS' release.

Read AIIS' complete lawsuit and complaint against President Trump's enforcement of tariffs on imported steel at aiis.org