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Republican presidential hopefuls  Ben Carson and Donald Trump   participate in the Republican Presidential Debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015.
Republican presidential hopefuls  Ben Carson and Donald Trump   participate in the Republican Presidential Debate at the Ronald Reagan Presidential Library in Simi Valley, California on September 16, 2015.

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    Trump, Carson go head-to-head

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Trump, Carson go head-to-head

Donald Trump and Ben Carson are the front runners of the Republican presidential candidates. CNN's Dana Bash reports on some mixed signals on foreign policy by Trump.

Trump, Carson go head-to-head

Donald Trump and Ben Carson are the front runners of the Republican presidential candidates. CNN's Dana Bash reports on some mixed signals on foreign policy by Trump.