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Republican presidential candidate, retired neurosurgeon Ben Carson, speaks during the Republican Presidential Debate, hosted by CNN, at The Venetian Las Vegas on December 15, 2015 in Las Vegas, Nevada.  AFP PHOTO/ ROBYN BECK / AFP / ROBYN BECK        (Photo credit should read ROBYN BECK/AFP/Getty Images)
Republican presidential candidate, retired neurosurgeon Ben Carson, speaks during the Republican Presidential Debate, hosted by CNN, at The Venetian Las Vegas on December 15, 2015 in Las Vegas, Nevada.  AFP PHOTO/ ROBYN BECK / AFP / ROBYN BECK        (Photo credit should read ROBYN BECK/AFP/Getty Images)

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    Ben Carson adviser downplays campaign resignations

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Ben Carson adviser downplays campaign resignations

CNN's Jim Sciutto talks with Ben Carson's business manager Armstrong Williams about three top aides resigning from Carson's campaign.

Ben Carson adviser downplays campaign resignations

CNN's Jim Sciutto talks with Ben Carson's business manager Armstrong Williams about three top aides resigning from Carson's campaign.