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    Marco Rubio and Donald Trump's vicious debate battle

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Marco Rubio and Donald Trump's vicious debate battle

Sen. Marco Rubio and Republican front-runner Donald Trump attacked each other on stage at the CNN GOP debate in Houston, Texas.

Marco Rubio and Donald Trump's vicious debate battle

Sen. Marco Rubio and Republican front-runner Donald Trump attacked each other on stage at the CNN GOP debate in Houston, Texas.