Adjusting Imports of Aluminum Into the United States: By the President of the United States of America, March 22, 2018 [open pdf - 179KB]
"2. In Proclamation 9704 of March 8, 2018 (Adjusting Imports of Aluminum Into the United States), I concurred in the Secretary's finding that aluminum articles are being imported into the United States in such quantities and under such circumstances as to threaten to impair the national security of the United States, and decided to adjust the imports of aluminum articles, as defined in clause 1 of Proclamation 9704 (aluminum articles), by imposing a 10 percent ad valorem tariff on such articles imported from all countries except Canada and Mexico."
Federal Register: http://www.gpo.gov/fdsys/browse/collection.action?collectionCode=FR
Federal Register (March 28, 2018), vol. 83 no. 60, p. 13355