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MILWAUKEE, WI - NOVEMBER 10:  Presidential candidate Rick Santorum speaks during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls.  (Photo by Scott Olson/Getty Images)
MILWAUKEE, WI - NOVEMBER 10:  Presidential candidate Rick Santorum speaks during the Republican Presidential Debate sponsored by Fox Business and the Wall Street Journal at the Milwaukee Theatre November 10, 2015 in Milwaukee, Wisconsin. The fourth Republican debate is held in two parts, one main debate for the top eight candidates, and another for four other candidates lower in the current polls.  (Photo by Scott Olson/Getty Images)

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Santorum: Debates should include everyone

Presidential candidate Rick Santorum challenges the process through which candidates make the main stage on debate night.

Santorum: Debates should include everyone

Presidential candidate Rick Santorum challenges the process through which candidates make the main stage on debate night.