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Republican presidential candidates (L-R) New Jersey Governor Chris Christie, Sen. Marco Rubio (R-FL), Jeb Bush and Sen. Ted Cruz (R-TX) after the Fox News - Google GOP Debate January 28, 2016 at the Iowa Events Center in Des Moines, Iowa.
Republican presidential candidates (L-R) New Jersey Governor Chris Christie, Sen. Marco Rubio (R-FL), Jeb Bush and Sen. Ted Cruz (R-TX) after the Fox News - Google GOP Debate January 28, 2016 at the Iowa Events Center in Des Moines, Iowa.

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Donald Trump and Jeb Bush at war on Twitter

Republican presidential candidates Donald Trump and Jeb Bush battle on Twitter while Chris Christie goes after Marco Rubio during the most recent debate.

Donald Trump and Jeb Bush at war on Twitter

Republican presidential candidates Donald Trump and Jeb Bush battle on Twitter while Chris Christie goes after Marco Rubio during the most recent debate.