Berzerker
Deity
It seems to me that this is unconstitutional, because tariffs (even if excused as being intended for national security) are revenue measures which must originate in bills passed first in the House of Representatives. The Senate could strike such measures down, but cannot constitutionally even propose taxes muhc less give that power to someone else.
Trump should be impeached or censured or whatever Congress does to express their disgust for abusing the power Congress gave him. But I suppose he'd argue our economic well being is a matter of national security and bad trade deals are a threat.