Two longtime U.S. Justice Department lawyers who examined the botched case against Ted Stevens disagreed sharply over whether the trial prosecutors engaged in misconduct, an internal report revealed.

The department’s Office of Professional Respon­sibility concluded in its 672-page report that two assistant U.S. attorneys “recklessly disregarded” their obligations to turn over favorable information to the lawyers for Stevens, charged in Washington in 2008 with filing false U.S. Senate financial disclosure reports.