Asked about the proposal on the day it was made, Trump said that if he judged it a hostile act he would impose very serious tariffs on Europe or curtail trade in many goods, and that heavy tariffs would follow if he read the intention as bad. He called the idea laughable and described Canada as a terrible trade partner.
What this label refers to
Relative to whether Canada should become an associate member of the European Union, Trump is against it and attaches a penalty to it, which is a substantive criticism of the proposal rather than of how it has been described. The conditional wording does not make this mixed: the condition attaches to his own reading of European intent and to what he would do about it, not to whether he supports the arrangement, and he separately calls the idea laughable. The closest competing label is minimizes, which loses because he treats the proposal as consequential enough to threaten trade over.