GOP hopefuls debate in Iowa sans Trump (23 images)
2016 Republican presidential candidates Kentucky Sen. Rand Paul , New Jersey Gov. Chris Christie, retired neurosurgeon Ben Carson, Texas Sen. Ted Cruz , Florida Sen. Marco Rubio, Former Florida Gov. Jeb Bush and Ohio Gov. John Kasich attend a GOP debate hosted by Fox News, January 28, 2016, in Des Moines, Iowa. Billionaire businessman Donald J. Trump boycotted the event.