“The question presented is whether the President acted within his authority when he issued Proclamation 9980, extending the tariffs to derivatives of steel and aluminum, after the 90- and 15-day time periods for concurrence and initial action set forth in 19 U.S.C. § 1862(c).”
“In sum, § 232’s deadlines did not prevent the President from modifying his initial timely adopted plan of action by issuing Proclamation 9980, and that conclusion does not render § 232 unconstitutional under the delegation doctrine.”