U.S. President Donald Trump on April 20 is expected to order an investigation on whether imports of foreign-made steel are harming national security, two unnamed White House official said April 19, Reuters reported. The order, issued under Section 232(B) of the Trade Expansion Act — a 1962 law giving U.S. presidents authority to pose restrictions on imports for reasons of national security — gives the U.S. Commerce Department 270 days to reach a conclusion on the issue. According to one official, the connection to national security stems from the use of some alloys in products such as the armor plating of ships. Over-reliance on imports, the official said, hampers the U.S. steel industry's ability to sustain production of and expertise in specific alloys needed for national security-related purposes. Executives from ArcelorMittal, Nucor, U.S. Steel, TimkenSteel, AK Steel and United Steelworkers have been invited to meet with the president at the White House on April 20, CNBC reported. Also on April 20, U.S. Steel will present an argument to the U.S. International Trade Commission asking that its antitrust complaint against rival Chinese steel manufacturers should be investigated, after a trade judge threw out the claim in November. The Trump administration has been exploring a number of new tools to support its trade agenda.