Is Ronald Reagan partly responsible for Donald Trump being president?

[Sir Mohamed]

Nah, besides the fact that the assumption Trump had not happened without the Bushes is pure speculation, there is way too much time in between. There are millions of option how events would or could have play(ed) out if you change one minor thing. It's like making Eisenhower responsible for Watergate, because he picked Nixon as his VP. Or: Watergate is JFK's fault since he selected Johnson as his running mate. Without Johnson, Kennedy had lost, Nixon would have been president 1961-69 and less paranoid, therefore no Watergate or no Carl Bernstein/Bob Woodward researching the story. I'm even skeptical on assumptions like that Gerald Ford winning 1976 would have prevented the GOP from trending to the right. It may have prevented President Reagan, but not the partisan shift towards the right.