title: Santorum to attend Trump's rally, campaign says
text: WASHINGTON (Reuters) - Republican presidential candidate Rick Santorum plans to join party front-runner Donald Trump at a rally in Iowa later on Thursday, his campaign said.  Santorum, a former U.S. lawmaker, will participate in the so-called “undercard” debate for Republican presidential candidates with less support in the polls before going to the event with Trump, who has vowed to skip Thursday night’s debate hosted by Fox News.     Former Arkansas Governor Mike Huckabee also said he plans to attend Trump’s event.  (Reporting by Ginger Gibson; Writing by Susan Heavey; Editing by Chizu Nomiyama) SAP is the sponsor of this coverage which is independently produced by the staff of Reuters News Agency.