Trump has consistently lost head-to-head national matchups with Clinton and Sanders. This is not a matter of debate. He is losing -5pts to Clinton which would be an electoral landslide. See all the polls where Trump is tanking at RealClearPolitics here. Compare to Rubio who is +4pts vs Clinton — that’s almost a net 10pt swing between Trump and Rubio!
Trump is a divisive candidate. He already has the highest unfavorabilities among Latinos of all candidates — that cannot be debated. See this Gallup poll where Trump has -50pts unfavorabilities. Remember Bush won 40% of the Latino vote and barely won, and Romney got around 23% and lost. Trump will struggle to even get to 20%.
Trump can never win in the general election. Even if he does, his Supreme Court justices would be in the mold of his sister, a social liberal who supports partial-birth abortion.