Rubio dismissed a video that appeared to show Bush rebuffing him during a break.
The prime-time debate on Fox Business drew 13.5 million viewers.
The group’s name is a tribute to a 1990s rap song by Sir Mix-a-Lot.
"Some people believe in the Bible, like I do, and don't find that to be silly at all."
Donald Trump on Monday invoked New England Patriots star quarterback Tom Brady to suggest himself as the best Republican presidential candidate on the international stage.
"Let's have a conservative network host a debate," said Fiorina.
The former president had no words for such a suggestion.
Marco Rubio answers 15 questions in latest campaign video.