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DALLAS, TX - SEPTEMBER 14: Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event. (Photo by Tom Pennington/Getty Images)

DALLAS, TX - SEPTEMBER 14:  Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event.  (Photo by Tom Pennington/Getty Images)

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DALLAS, TX - SEPTEMBER 14: Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event. (Photo by Tom Pennington/Getty Images)

DALLAS, TX - SEPTEMBER 14:  Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event.  (Photo by Tom Pennington/Getty Images)

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DALLAS, TX - SEPTEMBER 14: Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event. (Photo by Tom Pennington/Getty Images)

DALLAS, TX - SEPTEMBER 14:  Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event.  (Photo by Tom Pennington/Getty Images)

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DALLAS, TX - SEPTEMBER 14: Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event. (Photo by Tom Pennington/Getty Images)

DALLAS, TX - SEPTEMBER 14:  Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event.  (Photo by Tom Pennington/Getty Images)

see more

DALLAS, TX - SEPTEMBER 14: Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event. (Photo by Tom Pennington/Getty Images)

DALLAS, TX - SEPTEMBER 14:  Republican presidential candidate Donald Trump speaks during a campaign rally at the American Airlines Center on September 14, 2015 in Dallas, Texas. More than 20,000 tickets have been distributed for the event.  (Photo by Tom Pennington/Getty Images)