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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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Trump the target

As the candidates prepare to face off in the CNN Debate at the Reagan Presidential Library, AC360 looks at how Donald Trump's opponents are already taking aim.

Trump the target

As the candidates prepare to face off in the CNN Debate at the Reagan Presidential Library, AC360 looks at how Donald Trump's opponents are already taking aim.