Doug Hampton, a former senior aide to Sen. John Ensign, pleaded not guilty Monday to charges that he violated Congressional revolving-door laws by lobbying the Nevada Republican shortly after leaving his job on the Hill.

Hampton, 48, who was cuckolded by his own boss, is facing up to five years in prison and hundreds of thousands of dollars in fines after participating in Ensign’s attempts to cover up the affair he was having with Hampton’s wife.

A federal grand jury indicted Hampton last month for breaking conflict-of-interest laws by contacting Ensign’s office in his capacity as a lobbyist for a Las Vegas airline company and an energy company less than a year after leaving his post on Capitol Hill in April 2008.

Hampton, a self-described whistle-blower who went public with the details of the affair in 2009, was silent at his arraignment at the U.S. District Court for the District of Columbia. Neither he nor his attorney, public defender A.J. Kramer, offered any comment on the case.

Judge Beryl Howell, who presided over the courtroom, scheduled another hearing on July 1 to give the defense time to analyze hundreds of thousands of pages of evidence that Kramer said the prosecution provided.

The indictment did not name Ensign, who in 2009 admitted that he had an affair with Cynthia Hampton, who was a campaign aide.