This article in The Guardian is everything:
Republicans closely resemble autocratic parties in Hungary and Turkey – study
The Republican party has become dramatically more illiberal in the past two decades and now more closely resembles ruling parties in autocratic societies than its former centre-right equivalents in Europe, according to a new international study.
In a significant shift since 2000, the GOP has taken to demonising and encouraging violence against its opponents, adopting attitudes and tactics comparable to ruling nationalist parties in Hungary, India, Poland and Turkey.
The shift has both led to and been driven by the rise of Donald Trump.