SIOUX CITY, Iowa — Republican presidential hopeful Mitt Romney says he would veto legislation that would allow certain illegal residents to become American citizens. During a campaign stop in western Iowa, Romney answered "yes" when he was asked whether he would refuse to sign what is known as the DREAM Act. Romney has said before that he would oppose the legislation, which would allow some illegal immigrant youths to earn permanent residency and eventually citizenship if they attend college or serve in the military.