A GOP-led effort to repeal the biggest parts of ObamaCare would cost about $42 billion less than previously expected, saving more than a half-trillion dollars over a decade, the congressional budget scorekeeper said Monday. Legislation to gut most of ObamaCare's mandates and taxes, known as Restoring Americans' Healthcare Freedom Reconciliation Act, would reduce the deficit by $516 billion over 10 years, according to the Congressional Budget Office (CBO). The bill is expected to get a vote in the House this week, and it has already been approved by the Senate. President Obama has said he would veto the bill.