This is the dark side of the republican party and a large segment of the American electorate. Many Americans don't see other Americans as "real Americans" and this demented belief guides their political ideology and the direction of the republican party. If you believe as many many Americans do that some percentage of your fellow citizens are illegitimate and the people they vote into office by extension are illegitimate and a danger to America, then there is no limiting factor on what should be done to prevent those userpers from controlling America politically. Stop them from voting, strip power away from the candidates they manage to elect, gerrymander districts to limit their political power, create laws to invalidate elections they manage to win, and if all that fails violence to stop their elected candidates from taking office. This is where the republican party is at.