Federal prosecutors want to show a jury that indicted Philadelphia District Attorney Seth Williams knew that bribery was wrong when he allegedly did official favors for gifts, and to do it, they're digging up one of the embattled district attorney's own cases.

In 2014, Williams brought charges against former Philadelphia Traffic Court President Judge Thomasine Tynes for accepting a $2,000 Tiffany bracelet as a bribe, an offense to which she pleaded guilty. The prosecution was part of Williams' highly publicized revival of a sting targeting multiple Philadelphia Democrats, initially scuttled by former state Attorney General Kathleen Kane.

Now, in Williams' own corruption case, prosecutors have asked the judge to allow public statements Williams made about the prosecution of Tynes as evidence he knowingly committed a crime by accepting vacations, a car, a custom-made couch and cash for helping out two local businessmen.