Letter from Harriet Miers to George W. Bush, October 27, 2005 [withdrawing as a nominee for the US Supreme Court]. Excerpt:

As you know, members of the Senate have indicated their intention to seek documents about my service in the White House in order to judge whether to support me. I have been informed repeatedly that in lieu of records, I would be expected to testify about my service in the White House to demonstrate my experience and judicial philosophy. While I believe that my lengthy career provides sufficient evidence for consideration of my nomination, I am convinced the efforts to obtain Executive Branch materials and information will continue.

As I stated in my acceptance remarks in the Oval Office, the strength and independence of our three branches of government are critical to the continued success of this great Nation. Repeatedly in the course of the process of confirmation for nominees for other positions, I have steadfastly maintained that the independence of the executive Branch be preserved and its confidential documents and information not be released to further a confirmation process. I feel compelled to adhere to this position, especially related to my own nomination. Protection of the prerogatives of the Executive Branch and continued pursuit of my confirmation are in tension. I have decided that seeking my confirmation should yield.

Read the full text of the letter [PDF]. Reported in JURIST's Paper Chase here.