Coal, evidently:
The White House is refusing to let special prosecutor Patrick J. Fitzgerald turn over to congressional investigators key documents from his investigation into the leak of Valerie Plame’s identity as a covert CIA operative, including reports of interviews with President Bush, Vice President Cheney and five top White House aides.
House Oversight Committee Chairman Henry Waxman disclosed this morning that Fitzgerald is cooperating with the congressional investigation and had agreed to turn over the documents – until the White House intervened.
Describing a renewed sense of urgency in the wake of former White House Press Secretary Scott McClellan’s recent assertion that “five of the highest ranking officials in the administration were involved” in the public disclosure of false information about the leak, Waxman today appealed to newly installed Attorney General Michael Mukasey to overrule his White House masters and release the documents.
http://www.washingtonpost.com/wp-dyn/content/blog/2007/12/03/BL2007120300889.html?hpid=opinionsbox1
And much much more in the article.