Treating Catholics as "what Christians believe" is just as wrong. Pretribulational premillennialism is a popular position in mainstream Christianity in the US, e.g.
https://en.wikipedia.org/wiki/Left_Behind_(novel)
https://en.wikipedia.org/wiki/Rapture's_Delight
It's all bullshit in the end, but I personally know many people that hold that view that consider themselves Christian. In fact, they think Catholics aren't Christian and are going to hell, because they worship idols.
More specifically, when talking about US politicians like Mike Huckabee that spout off weird religious stuff like this, you can assume protestantism at least, if not fundamentalism and associated woo.
