Brett Kavanaugh, President Trump’s nominee to replace Anthony Kennedy on the Supreme Court, has testified to the Senate that “a good judge must be an umpire — a neutral and impartial arbiter.” He and his supporters want us to believe that he would be such an umpire on the Supreme Court. But does his record support him? The refusal of the Senate Judiciary Committee majority to share thousands of highly pertinent documents naturally raises skepticism. But there is plenty already in the public record about which Judge Kavanaugh has yet to be held accountable.

Anticipating the imminent publication of Kenneth Starr’s memoir of the Clinton impeachment, I looked into Judge Kavanaugh’s files in the Office of Independent Counsel records, housed in the National Archives. What I discovered sheds light on how Mr. Kavanaugh made his way in his early career, and how he flagrantly breached his role as a neutral public servant and followed the imperatives of a political operative.

Mr. Kavanaugh served under Mr. Starr as associate independent counsel between 1994 and 1997, and then again in 1998. Although not yet a judge, he was charged with investigating impartially what Attorney General Janet Reno deemed substantial accusations of misconduct arising from a failed real estate investment known as Whitewater.

Judge Starr’s predecessor as independent counsel, Robert Fiske, had looked into unfounded claims that the White House counsel Vincent Foster, who committed suicide in Fort Marcy Park in 1993, had in fact been murdered as part of an alleged White House cover-up related to Whitewater. After a thorough investigation, Mr. Fiske concluded in 1994 that there was nothing to the conspiracy theories and that Mr. Foster, who suffered from depression, had indeed killed himself. Official accounts by the National Park Service in 1993 and by a Republican congressman, William Clinger, the ranking member of the House Government Affairs Committee in 1994, came to an identical conclusion, as did a bipartisan report of the Senate Banking Committee early in 1995.