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
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Presidential candidate Rick Santorum challenges the process through which candidates make the main stage on debate night.
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Meet Rick Santorum 12 videos
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
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Rick Santorum: Obama not taking ISIS threat seriously
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Santorum: I respect the Democrats 'because they fight!'
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Santorum: 'I'm a capitalist, not a corporatist'
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Former US Republican Senator from Pennsylvania Rick Santorum speaks at the Conservative Political Action Conference (CPAC) in National Harbor, Maryland, on March 15, 2013.
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Who is Rick Santorum?
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Former U.S. Senator Rick Santorum (R-PA) announces his candidacy for the 2016 Republican nomination for president at Penn United Technologies May 27, 2015 in Cabot, Pennsylvania.
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One voter shows up for Santorum events
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Rick Santorum: 'Clearly the Earth has warmed'
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Santorum: I would accept Jenner's endorsement
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Former Sen. Rick Santorum, with wife Karen (right), daughter Bella, 7, and the rest of the family, announces his candidacy for the 2016 Republican nomination for president at Penn United Technologies on May 27, 2015, in Cabot, Pennsylvania.
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Rick Santorum: Obamacare is an 'injustice'
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Rick Santorum: Signing 4 or 5 people is a success
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Santorum: Obama's 'not effectively fighting this war'
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Former U.S. Sen. Rick Santorum (R-PA) speaks during the NRA-ILA Leadership Forum at the 2015 NRA Annual Meeting & Exhibits on April 10, 2015 in Nashville, Tennessee.
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Rick Santorum announces 2016 presidential bid
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