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Real estate tycoon Donald Trump speaks during the prime time Republican presidential debate on August 6, 2015 at the Quicken Loans Arena in Cleveland, Ohio. AFP PHOTO/MANDEL NGAN        (Photo credit should read MANDEL NGAN/AFP/Getty Images)
Real estate tycoon Donald Trump speaks during the prime time Republican presidential debate on August 6, 2015 at the Quicken Loans Arena in Cleveland, Ohio. AFP PHOTO/MANDEL NGAN        (Photo credit should read MANDEL NGAN/AFP/Getty Images)

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Trump: I would be Hillary's 'worst nightmare'

CNN's Jake Tapper speaks with GOP presidential candidate Donald Trump on leading the Iowa polls, other GOP contenders and Hillary Clinton.

Trump: I would be Hillary's 'worst nightmare'

CNN's Jake Tapper speaks with GOP presidential candidate Donald Trump on leading the Iowa polls, other GOP contenders and Hillary Clinton.