Live: A trailer with a sign supporting Republican presidential candidate Donald Trump, and satellite trucks, are parked on the campus of Drake University in Des Moines, Iowa,Thursday, Jan. 28, 2016, where Trump is scheduled to hold a campaign event. (AP Photo/Jae C. Hong)
Live: A trailer with a sign supporting Republican presidential candidate Donald Trump, and satellite trucks, are parked on the campus of Drake University in Des Moines, Iowa,Thursday, Jan. 28, 2016, where Trump is scheduled to hold a campaign event. (AP Photo/Jae C. Hong) Jae C. Hong AP
Live: A trailer with a sign supporting Republican presidential candidate Donald Trump, and satellite trucks, are parked on the campus of Drake University in Des Moines, Iowa,Thursday, Jan. 28, 2016, where Trump is scheduled to hold a campaign event. (AP Photo/Jae C. Hong) Jae C. Hong AP

Texas billionaire offers incentive for Trump to debate Cruz

January 28, 2016 08:59 PM