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How big of a Trumpist would BG be? >>
It's hard to say, because Trump and MAGA are billions of light years to the right of any previous president of any party, and of what used to be called "conservatism".
Billy Graham lied after Watergate and Nixon's impeachment-resignation that he had become "non-partisan". In fact, he made little secret of his political support for Ronald Reagan, George HW Bush, and George W Bush. Before them, he openly endorsed and strongly approved of Richard Nixon (though he expressed some regrets after Watergate) and the Vietnam War; even suggesting to Nixon that he bomb the dikes and kill by drowning perhaps one million Vietnamese peasants (you know, just like Jesus would do).
I suspect he would support Trump -- though perhaps not as enthusiastically as his Trumpvangelical son, Franklin -- and policies like supporting Israel's genocide and ethnic cleansing in Palestine. Like MAGAs, he was at the same time both anti-semitic and supportive of anything Israel chooses to do. Israel, the so-called "Holy Land" that the god Yahweh supposedly "gave to the Jews", and that will supposedly be mass-converted to Christianity (with Jewish holdouts and refuseniks being perp-walked straight to the fires of Hell by horned, pitchfork-wielding demons) after the World War III "Armageddon" that evangelicals look forward to happening sometime soon.