Republican presidential candidates Donald Trump (L) and  Ted Cruz (R) participate in the Republican Presidential Candidates Debate on February 6, 2016 at St. Anselm's College Institute of Politics in Manchester, New Hampshire. 
Seven Republicans campaigning to be US president are in a fight for survival in their last debate Saturday before the New Hampshire primary, battling to win over a significant number of undecided voters. / AFP / Jewel Samad        (Photo credit should read JEWEL SAMAD/AFP/Getty Images)