From the Cato Institute:

Furthermore, as Clark Packard and Megan Reiss of the R Street Institute note, such production easily satisfies U.S. defense requirements with “only about 3 percent of steel shipped domestically in 2016 used for national defense and homeland security.” And while Paul appears to imply that one American company for electrical steel and one for the steel used in the production of a particular type of submarine are insufficient, he makes no mention of why this is a problem or what a more appropriate number might be. Moreover, should the United States experience a shortfall or inability to produce the product domestically there is no reason why it couldn’t fill this gap via imports. The United States, Packard and Reiss point out, does not lack for viable options should foreign sources be needed:

The United States also has a number of options to source steel from allies and non-hostile trading partners. In fact, of the top ten exporters of steel to the United States in 2016, only China could be considered a potential threat. Moreover, that threat becomes far less pressing when one considers how small a share China has of overall U.S. steel imports. China is only the source of 3 percent of American steel imports. Otherwise, 60 percent of imported steel mill products come from six other countries, none of which could plausibly be considered a threat to national security. According to the most recent available data from the International Trade Administration, between January and October 2017, the top exporter of steel to the United States is Canada, which accounted for 16 percent of imports during this period; Brazil, which accounted for 13 percent; South Korea, which accounted for 10 percent; Mexico, which accounted for 9 percent; Turkey, which accounted for 6 percent; and Japan, which accounted for 5 percent. 

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