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    GOP rivals debate how to take on Donald Trump

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GOP rivals debate how to take on Donald Trump

There are 17 Republican presidential candidates, only the top ten in certain national polls will get a podium at Thursday's debate. CNN's Dana Bash reports.

GOP rivals debate how to take on Donald Trump

There are 17 Republican presidential candidates, only the top ten in certain national polls will get a podium at Thursday's debate. CNN's Dana Bash reports.