> He is unique in that he seems to have absolute control over the Republican base which makes all internal party checks fail. The rest is provided by a hyper polarized media landscape and a conservative supreme court majority that seems to be open to radical upheavals. The combination of all three has rendered the constitutional safe guards ineffective. In other words, we seem to have run into an edge case in the US constitution.

The US constitution has absolutely nothing at all to say about political parties or the particular state of the media landscape, or for that matter the partisan alignment of justices of the supreme court. It's incoherent to suggest that there are "constitutional safe guards" that should have prevented the election of a president (or the exercise of power by that president), who is supported by about one-half of a very polarized electorate and opposed by a separate one-half. Everything about the Trump presidency is as constitutional as every previous US presidency, including the phenomenon of opponents of the president trying to claim that specific things they do are or should be unconstitutional.