Republicans in the U.S. House and Senate are demanding a federal investigation into unemployment benefits money lost to fraudsters, calling it the “greatest theft of American tax dollars in our nation’s history.” The members sent a letter to the Government Accountability Office, asking the federal oversight group to investigate the fraud and arguing structural issues exist within the federal government that make the theft possible. “It is concerning that responsibility for determining how much fraud has occurred lies scattered throughout a web of bureaucracies,” the letter reads. “The scattering of responsibilities suggests that Congress will be ill equipped to have adequate information to assess future unemployment insurance responses to large economic shocks; and, at the same time, ensure they are not plagued by gaping security holes that allow fraudsters an open window to use to unlawfully obtained taxpayer funds.” The question of unemployment fraud takes on extra weight as lawmakers …