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    Jeb Bush and Donald Trump spar over 9/11

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Jeb Bush and Donald Trump spar over 9/11

Presidential candidates Donald Trump and Gov. Jeb Bush's war of words over 9/11 has reached a fever pitch, with both candidates lashing out on Twitter. CNN's Dana Bash reports.

Jeb Bush and Donald Trump spar over 9/11

Presidential candidates Donald Trump and Gov. Jeb Bush's war of words over 9/11 has reached a fever pitch, with both candidates lashing out on Twitter. CNN's Dana Bash reports.