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    Trump gets serious, Rubio and Cruz go to battle

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Trump gets serious, Rubio and Cruz go to battle

Donald Trump tries to take a serious tone while rivals Sen. Marco Rubio and Sen. Ted Cruz spar over immigration reform. CNN's Dana Bash reports.

Trump gets serious, Rubio and Cruz go to battle

Donald Trump tries to take a serious tone while rivals Sen. Marco Rubio and Sen. Ted Cruz spar over immigration reform. CNN's Dana Bash reports.