Duh - It ain't about the master file.
As usual congressional wing-nuts are making cost improvement unduly complicated. Death records are a matter of historical public record - go to any courthouse. The only question is whether the records will be accumulated in a central database that can be more readily accessed and used for several good reasons.
That's just the sort of effort a bipartisan effort should support. But, there is an ulterior motive if you look below the surface - a common death data base could make it more difficult for a congressman's dead constituents to vote for them.