Rush Limbaugh may be sorry he called student advocate Sandra Fluke a "slut," but Ron Paul isn't buying it.

"He's doing it because some people were taking their advertisements off of his program. It was his bottom line he was concerned about," Paul said. "I don't think he's very apologetic. It's in his best interest, that's why he did it."

Limbaugh is facing intense backlash after ranting calling Fluke, a Georgetown University law student who testified in Congress in support of Obama's birth control rule, a "slut" and a "prostitute." Several advertisers have pulled ads from his show and a slew of journalists and politicians have spoken out against his remarks. Even President Obama called Fluke to express his support for her.

Though Limbaugh apologized for his comments, the damage may be done. Several sponsors who backed out have said they won't reverse course in light of his apology.

Paul also called Limbaugh's comments "over the top," though he maintained that he did not support Obama's mandate.