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AMES, IA - JANUARY 19:   Republican presidential candidate Donald Trump acknowledges the crowd as former Alaska Gov. Sarah Palin speaks at Hansen Agriculture Student Learning Center at Iowa State University on January 19, 2016 in Ames, IA. Trump received Palin's endorsement at the event.  (Photo by Aaron P. Bernstein/Getty Images)
AMES, IA - JANUARY 19:   Republican presidential candidate Donald Trump acknowledges the crowd as former Alaska Gov. Sarah Palin speaks at Hansen Agriculture Student Learning Center at Iowa State University on January 19, 2016 in Ames, IA. Trump received Palin's endorsement at the event.  (Photo by Aaron P. Bernstein/Getty Images)

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CNN's Don Lemon speaks to Donald Trump about Sarah Palin and her son's PTSD and arrest.

Trump: 'I suggested it'

CNN's Don Lemon speaks to Donald Trump about Sarah Palin and her son's PTSD and arrest.