Reading Time: 1 minutes

Republican presidential candidates (L-R) New Jersey Governor Chris Christie, Senator Marco Rubio, R-Florida., former Florida Governor Jeb Bush and Senator Ted Cruz, R-Texas, talk after the Republican presidential primary debate, Des Moines, Iowa, January 28, 2016 (AP Photo/Charlie Neibergall)

Republican presidential candidates (L-R) New Jersey Governor Chris Christie, Senator Marco Rubio, R-Florida., former Florida Governor Jeb Bush and Senator Ted Cruz, R-Texas, talk after the Republican presidential primary debate, Des Moines, Iowa, January 28, 2016 (AP Photo/Charlie Neibergall)