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MANCHESTER, NH - FEBRUARY 06:  Republican presidential candidates New Jersey Governor Chris Christie (2nd R) and Donald Trump visit as Sen. Marco Rubio (R-FL) (L) stands close by during a commercial break in the Republican presidential debate at St. Anselm College February 6, 2016 in Manchester, New Hampshire. Sponsored by ABC News and the Independent Journal Review, this is the final televised debate before voters go to the polls for the New Hampshire primary on February 9.  (Photo by Joe Raedle/Getty Images)
MANCHESTER, NH - FEBRUARY 06:  Republican presidential candidates New Jersey Governor Chris Christie (2nd R) and Donald Trump visit as Sen. Marco Rubio (R-FL) (L) stands close by during a commercial break in the Republican presidential debate at St. Anselm College February 6, 2016 in Manchester, New Hampshire. Sponsored by ABC News and the Independent Journal Review, this is the final televised debate before voters go to the polls for the New Hampshire primary on February 9.  (Photo by Joe Raedle/Getty Images)

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