Rudy Giuliani suffered a setback Thursday as the D.C. Bar’s attorney disciplinary committee announced he likely violated at least one attorney practice rule while embarking on his bid to overturn President Joe Biden’s 2020 win in Pennsylvania. The decision, which is only tentative, came after the D.C. bar’s disciplinary counsel’s office argued that the former Trump attorney had “weaponized his law license to bring a frivolous action in an attempt to undermine the Constitution.” Giuliani defended his work on the failed election fraud lawsuit last week, which sought to toss votes cast in Pennsylvania in 2020 and was ultimately rejected by a judge. Giuliani’s law license in D.C. was temporarily suspended last year due to a suspension in New York that called for disciplinary action over “demonstrably false and misleading” statements about the presidential election. Disciplinary proceedings are still ongoing, and Giuliani could get off with a warning—or he could lose his D.C. license altogether.