In my book The Cult of Trump, I present a thesis that Donald Trump was a symptom of decades of right-wing maneuvering to gain power and institute a theocracy by eliminating the separation between Church and State, which the Founders of the Constitution tried to ensure would not happen. White evangelical Christians, among other powerful groups like The Family, Opus Dei, and the New Apostolic Reformation, appear to support this movement and, indeed, are the driving force behind it because they believe Trump is being used to do ‘God’s work.’
Someone very experienced in talking about this issue is Frank Schaeffer. He was born and bred into an evangelical fundamentalist life and went on to play an active role in helping to politicize evangelical leaders. He has now bravely written and spoken about his regret at the part he played in this process and is an active religious reform activist.