[Starboard]

“It’s what the Constitution says that matters.”

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No, its how the Constitution is interpreted by the courts that matters.

[Alberta's Child]

The Congress shall have Power To lay and collect Taxes, Duties, Imposts and Excises … — U.S. Constitution (Article I, Section 8)

If a U.S. court interprets that to mean that the President can unilaterally impose tariffs on his own, then your constitution isn’t worth the paper it’s printed on.