Last year, state Rep. Jeremy Durham of Franklin and Sen. Brian Kelsey of Germantown, both Republicans, sponsored legislation requiring that Tennessee lawmakers in the General Assembly get final say over whether the state expands Medicaid under the Patient Protection and Affordable Care Act. At the time, it seemed unlikely that Gov. Bill Haslam would work out a deal with the Obama administration to gain access to the hundreds of millions of dollars the federal government is using to entice states to grant more government-financed health coverage to lower income populations. In December, though, the governor announced that he’d done just that — and at no additional cost to the state’s budget. But neither Durham nor Kelsey is buying it; They argue that the federal government, overextended already, can’t be trusted to make good on its commitment to pay for the expansion in years to come. They plan to press hard against the governor’s “Insure Tennessee” proposal when lawmakers take it up in earnest next month.