This May 1, 2005 UK Times article, Blair hit by new leak of secret war plan, is referenced in this May 5, 2005 letter of inquiry (8 pages, PDF) to President Bush, signed by 88 U.S. Representatives. The letter asks five specific questions in an effort to seek verification that the “United States and Great Britain had secretly agreed to attack Iraq in the summer of 2002, well before the invasion and before [you] even sought Congressional authority to engage in military action.”
Related references:
Blair Was Told of White House’s Determination to Use Military Against Hussein