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DES MOINES, IA-SEPTEMBER 19: Republican Presidential Candidate Donald Trump speaks at the Iowa Faith & Freedom Coalition 15th Annual Family Banquet andPresidential Forum held at the Iowa State fairgrounds on September 19, 2015 in Des Moines, Iowa.  Eight of the Republican candidates including Trump are expected to attend the event. (Photo by Steve Pope/Getty Images)
DES MOINES, IA-SEPTEMBER 19: Republican Presidential Candidate Donald Trump speaks at the Iowa Faith & Freedom Coalition 15th Annual Family Banquet andPresidential Forum held at the Iowa State fairgrounds on September 19, 2015 in Des Moines, Iowa.  Eight of the Republican candidates including Trump are expected to attend the event. (Photo by Steve Pope/Getty Images)

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    Is Donald Trump's lead slipping away?

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Is Donald Trump's lead slipping away?

The new Republican presidential poll numbers show Donald Trump's lead slipping. CNN's Dana Bash has the details.

Is Donald Trump's lead slipping away?

The new Republican presidential poll numbers show Donald Trump's lead slipping. CNN's Dana Bash has the details.