Trump Skipping GOP Debate

Republican presidential candidate Donald Trump speaks during a campaign stop, Jan. 27, 2016, in Gilbert, S.C.

Republican presidential candidate, Sen. Ted Cruz, R-Texas, speaks at a campaign event, Jan. 27, 2016 in West Des Moines, Iowa.

Republican presidential candidate Sen. Marco Rubio (R-FL) speaks at a campaign rally at Wellman's Pub and Rooftop in West Des Moines, Iowa, Jan. 27, 2016.

Republican presidential candidate, Ohio Gov. John Kasich speaks during a town hall meeting, Jan. 27, 2016, in Davenport, Iowa.

Democratic presidential candidate Hillary Clinton speaks at a rally at BR Miller Middle School in Marshalltown, Iowa, Jan. 26, 2016.

Democratic presidential candidate, Sen. Bernie Sanders, I-Vt, speaks during a campaign event at Music Man Square, Jan. 27, 2016, in Mason City, Iowa.