The $850 million Obama Presidential Center officially opened on Chicago's South Side, but outside the ceremony, contractors who worked on the project were demanding payment, claiming they're still owed nearly $100 million for work completed on the center. #fox #media #breakingnews #us #usa #new #news #breaking #foxnews #barackobama #obama #obamapresidentialcenter #chicago #illinois #politics #political #politicalnews #government #construction #contractors #business #economy #economic #finance #