PHILADELPHIA -- Rush Limbaugh told his radio audience Friday that he is amazed at the controversy over his comments about a black quarterback, but did not comment on reports that he's being investigated for illegally buying prescription drugs.

The conservative commentator gave up his job as an ESPN sports analyst after saying Philadelphia Eagles quarterback Donovan McNabb was overrated because the media wanted to see a black quarterback succeed.

"It's amazing to me that this is a controversy at all. Had what I said been said by anybody else ... it wouldn't have gotten scant attention," he said Friday.

He made the comment about McNabb on ESPN's "Sunday NFL Countdown."

"It took two days for there to be any reaction. There wasn't any reaction to it even on the ESPN set," said Limbaugh, a Cape Girardeau native who says he has gotten thousands of supportive e-mails and phone calls.

Law enforcement sources in Florida confirmed to The Associated Press on Thursday that Limbaugh is being investigated for illegally buying prescription drugs.

"I don't yet know what I'm dealing with there, folks," Limbaugh said. "I don't want to deal with hypotheticals, and I don't want to respond to what's in the press."

Limbaugh resigned his ESPN position late Wednesday and said Thursday that he was leaving so the sports network's employees would be spared the uproar over his comments.