Concern is mounting that taxpayers could be left holding the bag if the Obama Presidential Center runs into financial trouble, as the foundation behind it has yet to establish a promised $470 million safety net to guard against a public bailout. The scrutiny comes as a Fox News Digital investigation found multiple contractors and subcontractors claiming losses ranging from hundreds of thousands of dollars to millions on the project, with some alleging they remain locked in payment disputes and face financial ruin just days before the center's grand opening. Under its agreement with the city, the Obama Foundation pledged to...