WASHINGTON (CNN) -- Michael Scanlon, a former top aide to Rep. Tom DeLay and a onetime partner of high-powered Washington lobbyist Jack Abramoff, pleaded guilty to a federal conspiracy charge Monday.

As part of the deal with the Justice Department, Scanlon agreed to testify against Abramoff in a probe that also has implicated at least one member of Congress, two government sources have told CNN.

Scanlon was charged Friday with one count of conspiracy as part of an ongoing federal criminal investigation of his and Abramoff's lobbying activities.

Scanlon, a 35-year-old public relations executive, agreed to pay $19.7 million in restitution for kickbacks he admitted receiving as part of the conspiracy to defraud his and Abramoff's clients.

"He's obviously regretful for the circumstances that bring him here, but he's trying to do what he thinks is right," his attorney, Plato Cacheris, told reporters after the hearing in federal district court.

Scanlon was freed on an unsecured $5 million bond pending sentencing. His only comment was: "You guys will be seeing me around."

As part of the plea agreement with federal prosecutors, Scanlon admitted plotting to cheat clients and corruptly influence federal officials.

...from CNN