I am writing to seek your assistance in the Oversight Committee's investigation into the circumstances surrounding the leak of the covert identity of CIA officer Valerie Plame Wilson. As the recent disclosure from former White House Press Secretary Scott McClellan underscores, there remain many unanswered questions surrounding this incident and the involvement of the President, the Vice President, and other senior White House officials in the security breach and the White House response.

The Special Counsel, Patrick...