The fundamentalists of the Right Wing cannot stand Catholics. They don't consider them Christians at all, and when push comes to shove, they'll sell the Catholics out right along with the gays and Pagans and atheists and immigrants. The fundies think they're literally on a mission from "god" and they don't owe anything to anyone they might use along their way to Judgement Day. They'll smile and pretend to respect the Catholics to get enough votes to end Roe v. Wade or keep gays from marrying, but if they ever get the theocracy they're working for, Catholicism will soon be driven out of America. Count on it.