On the U.S. nuclear weapons program:

The United States' current approach to maintaining its nuclear arsenal "looks increasingly unsustainable," according to an internal report by senior officials at the nation's three nuclear weapons labs.

The nuclear weapons program's future costs exceed the available budget, and the effort to maintain aging warheads is forcing the nation to retain a larger nuclear arsenal than would otherwise be needed, the report concludes.

Completed last month, the report's findings mirror in some respects those of a key House of Representatives subcommittee.

The House Energy and Water Appropriations Subcommittee issued a report last month calling for a sweeping reorganization of the U.S. nuclear weapons complex as part of its proposed 2006 Department of Energy budget.