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SIOUX CENTER, IA - JANUARY 31:  Republican presidential candidate Donald Trump attends a campaign rally at the Sioux City Orpheum Theatre on January 31, 2016 in Sioux City, Iowa. Trump and other presidential hopefuls are in Iowa trying to gain support and crucial votes for tomorrow's caucuses.  (Photo by Joe Raedle/Getty Images)
SIOUX CENTER, IA - JANUARY 31:  Republican presidential candidate Donald Trump attends a campaign rally at the Sioux City Orpheum Theatre on January 31, 2016 in Sioux City, Iowa. Trump and other presidential hopefuls are in Iowa trying to gain support and crucial votes for tomorrow's caucuses.  (Photo by Joe Raedle/Getty Images)

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Stuart Stevens speaks about the Republican presidential race alongside Matt Frei of Britain's Channel 4 News, filmmaker of "The Mad World of Donald Trump."

Romney strategist: Trump a 'dangerous, unstable person'

Stuart Stevens speaks about the Republican presidential race alongside Matt Frei of Britain's Channel 4 News, filmmaker of "The Mad World of Donald Trump."