The tariffs are claimed to be a national security emergency and without the approval or Congress, therefore the composition of Congress won't matter unless the Supreme court judges otherwise.
But the Supreme Court is going to judge, sooner rather than later. I sincerely hope they will rule against Trump (that seems to me the way that the merits of the case demand).
I believe the president has the right to impose tariffs if it is for national security reasons. National security can be widely applied towards many products like food and major inputs like tech, metals, drugs, etc.
Therefore, the administration can simply re-classify any existing tariffs that are not justified for national security reasons and fall within this product mix.
