Republican presidential candidate Sen. Marco Rubio, R-Fla., center, answers a question as Sen. Ted Cruz, R-Texas, left, and former Florida Gov. Jeb Bush, right, listen during a Republican presidential primary debate, Thursday, Jan. 28, 2016, in Des Moines, Iowa.
Republican presidential candidate Sen. Marco Rubio, R-Fla., center, answers a question as Sen. Ted Cruz, R-Texas, left, and former Florida Gov. Jeb Bush, right, listen during a Republican presidential primary debate, Thursday, Jan. 28, 2016, in Des Moines, Iowa. Charlie Neibergall AP
Republican presidential candidate Sen. Marco Rubio, R-Fla., center, answers a question as Sen. Ted Cruz, R-Texas, left, and former Florida Gov. Jeb Bush, right, listen during a Republican presidential primary debate, Thursday, Jan. 28, 2016, in Des Moines, Iowa. Charlie Neibergall AP

Donald Trump looms large in GOP debate, without being there

January 28, 2016 11:02 PM