Declaration of Trade War has now been signed.

whitehouse.gov

Very long so I won’t put it here. He (or likely his lackies) lay out the justification for steel and aluminum tariffs.

One section:

(4) Within 10 days after the date of this proclamation, the Secretary shall issue procedures for the requests for exclusion described in clause 3 of this proclamation. The issuance of such procedures is exempt from Executive Order 13771 of January 30, 2017 (Reducing Regulation and Controlling Regulatory Costs).