Trump got 49% of the votes cast, which is roughly a quarter of the US population.

Do you have a better way of determining which party is the "majority" in Congress? That is what we are discussing here. Whether the current makeup of Congress accurately represents the votes of the people or not.

Obviously I understand that not every person voted in the election (many are not even eligible). It is simply not relevant to this conversation, and is an often trotted out diversion meant to diminish the mandate given by the actual voters.

In this case it’s much simpler: the question was minority rule and you can see that power in the executive, legislative, and judicial branches is held by Republican politicians representing less than a majority—Trump is arguably the best claim they have on plurality since he is come very close to winning the popular vote since so many Democrats stayed home—and enacting policies which are very unpopular, in most cases policies which are unpopular even among registered Republicans.