The American Institute for International Steel and two of its members companies are challenging the constitutionality of President Donald Trump's 25 percent tariff on steel and aluminum imports.

AIIS filed a lawsuit Wednesday in the U.S. Court of International Trade in New York City seeking to overturn the president's decision as well as a court order preventing further enforcement of the tariff increase. Steel product distributors SIM-TEX and Kurt Orban Partners joined in the suit.

The group argues the statute Trump used to impose the tariffs—Section 232 of the Trade Expansion Act of 1962—violates the constitutional prohibition against Congress delegating its legislative powers to the president because the law is broadly written.

"In addition to the totally open-ended choice of how to counter any threat that imports may present, Section 232 allows the President to consider virtually any effect on the U.S. economy as part of ‘national security,'" AIIS President Richard Chriss said.

AIIS is a $332,000-revenue association based in Falls Church, Va. http://bit.ly/2z4Q8Qz

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