'Bunker buster' may return

Defense Secretary Donald Rumsfeld sent a memo last month to then-Energy Secretary Spencer Abraham saying next year's budget should include funds to resume study of building an earth-penetrating nuclear weapon designed to destroy hardened underground targets.
An Energy Department official said Monday that $10.3 million to restart that study is expected to be included in the Bush administration's budget, which is to be released next week.
...The program has been restricted each year by Senate and House members who have argued that even studying the potential for such a new nuclear weapon undermines Washington's attempts to limit other countries from developing their own nuclear arsenals.