As noted previously here and by others, Trump is not an aberration. The Trump phenomenon is the result of a natural progression of corrosive Republican party tactic over recent decades. The Bushes in particular embraced extreme tactics in political campaigns. George H.W. Bush was expert at the pivot from divisive campaign tactics to more normal behavior as president. George W. Bush carried tactical politics to an extreme in both campaigns and governing. Rich Benjamin has a pretty good rundown in the allotted space today in WaPo: George W. Bush is not part of the Resistance. He's part of what brought us Trump.
Benjamin's piece is mostly spot on, but the ending is a bit off; "Americans may like to forget history. But this year is showing us in real time that we are, indeed, doomed to repeat it."
Actually, we are not repeating history. We are experiencing the natural progression of history that happens when tactics employed to win become more important than any other consideration - like survival of the republic.
The Trump phenomenon is more extreme than the Bush phenomenon ever was. Anything bad about Bush is taken to a never-before experienced extreme with Trump. With Trump, literally no one knows where this goes. If the current Republican Congress continues to support Trump, everything has to get worse before it gets better.