Sen. Rand Paul shares a passion with President Trump: Golf. The two teed it up on Sunday, and afterward, Paul said, "The president never loses, didn’t you know?"

But the two also share another passion: Hating on Sen. John McCain. The Arizona Republican "maverick" drew the ire of the president when he suddenly changed his mind and voted against the Trump-supported replacement for Obamacare.

Paul, a Kentucky Republican, targeted McCain and his right-hand man, Sen. Lindsey Graham (R-SC), on Tuesday, slamming the two for "parading" as conservatives.

"People like McCain and Graham, who parade as conservatives but are not really conservative, they need to be called out because they are bankrupting our country," Paul said Tuesday.

Paul called Graham — who coincidentally has also played golf with Trump — part of the "problem" in the swamp that is Washington, D.C.

"Lindsey Graham wouldn't know a conservative if he met one, all right?" Paul said on C-Span. "He's never been a conservative. He's probably a big part of why we have such a massive debt in this country."

“So no, I don’t consider him to be a conservative,” he added, “nor a bona fide Republican critic. I do think though that he’s part of the problem.”

Paul said both parties refuse to pass sensible — and conservative — legislation, which has led to massive debt.

"Why is the deficit bigger all the time, under Republicans or Democrats?" Paul said. "Because neither one of them are conservative. And I frankly am infuriated by the idea that these people will continue to throw wool over the eyes of the American voter and simply say 'Oh we're conservative' and yet they pass stuff that is just frankly, not conservative."

Paul took to Twitter to bash the pair.

With a big vote on tax cuts looming, the intra-party feuding won't be helpful. And you can bet Trump will be weighing in soon, too — likely on Twitter.