A federal judge has refused to step aside from a Philadelphia case after disqualifying District Attorney Larry Krasner and one of his top deputies and sending their conduct to the Department of Justice for investigation.
U.S. District Judge Paul Diamond denied as frivolous the Philadelphia District Attorney’s Office motions seeking his recusal from all matters involving the office and reconsideration of his rulings. The office filed those requests after Diamond barred Krasner and Assistant District Attorney Matthew Stiegler from further participation in the case and referred both men for potential prosecution over alleged misconduct described in sworn testimony.
The fight centers on whether senior prosecutors urged subordinates to mislead a federal court, and whether a judge who credited that testimony can keep the case. Diamond’s order treats the dispute as more than a routine clash over credibility. It frames the accusations, if proven, as possible criminal misconduct at the top of the city’s chief prosecuting office.
Diamond described a three-day hearing in which four DAO supervisors, referred to in the order as “the Four,” gave testimony the court called credible and powerful. According to the judge’s account of that testimony, Krasner and Stiegler urged the supervisors to make false representations to the court to “protect the office.”
The order states that the supervisors said the District Attorney threatened them with “consequences” if they refused. When the Four told Krasner that the situation created a conflict requiring them to inform the court and withdraw, the threat language remained part of the account Diamond accepted for purposes of disqualification and referral.
Diamond wrote that the accusations, if true, could amount to criminal misconduct. On that basis he disqualified the District Attorney and Stiegler from participating further in the case and referred the matter to the Department of Justice for investigation.
In the order, the judge put the core finding in stark terms:
"The DAO’s present post-trial concession is also remarkable: Here, four DAO supervisors credibly testified that the District Attorney himself and his lieutenant, Assistant District Attorney Matthew Stiegler, urged them to make false representations to this Court to “protect the office.”"
He continued that the Four said Krasner threatened “consequences,” and that those claims drove both the disqualification and the DOJ referral.
Diamond did not treat the episode as an isolated dust-up. He placed it against a recent backdrop of judicial criticism of the Philadelphia DAO’s post-trial concessions.
In the last two years, he wrote, the Third Circuit, his own court, and the Philadelphia Common Pleas Court condemned as dishonest repeated post-trial concessions made by the office. The Pennsylvania Supreme Court went further. It ordered all Philadelphia Common Pleas judges to seek intervention from the Pennsylvania Office of Attorney General whenever the DAO made a post-trial concession, so the Attorney General could confirm the concession’s honesty.
Diamond stressed that the seriousness of the alleged conduct rose because it came after four courts had already condemned DAO behavior in circumstances like those before him. Lying to a court, urging others to lie, or threatening colleagues who insist on telling the court the truth rank among the gravest attorney transgressions, he wrote.
A central theme in the order is what the District Attorney did not do at the hearing. Diamond noted that Krasner neither testified nor offered an affidavit responding to the Four’s testimony, the same testimony that supported disqualification and the DOJ referral.
The judge rejected as absurd any suggestion that Krasner did not know he could testify. Diamond said he twice asked DAO counsel whether the office wished to call any witnesses. He also observed that Krasner never explained why he skipped a responsive affidavit, a filing that would have required the declarant to tell the truth under penalty of false swearing.
In Diamond’s words, the office cannot truthfully dispute that the District Attorney chose not to give his version of events in court under oath. The judge said the DAO’s belief that this tactical choice was reasonable does not warrant recusal.
After the unfavorable decision, Krasner submitted a belated, unsworn “Declaration” attacking three of the witnesses as unworthy of belief. Diamond called that move an after-the-fact attempt to cram “evidence” into a closed record and said it seemed intended to persuade the media, not the court. He found the material unpersuasive and insufficient for reconsideration.
The DAO sought Diamond’s removal from all matters in which the office appears and asked him to revisit his rulings in the present case. Reason’s coverage of the order, including the judge’s denial of those requests, is detailed in Eugene Volokh’s report on the filing.
Diamond held that the office failed to object during the three-day hearing to virtually all the rulings and actions it later challenged. Objecting only after a decision went against the District Attorney and his lieutenant, the judge wrote, confirms mere disagreement with those rulings.
He addressed the office’s attack on his credibility calls, including its argument that he should have been more skeptical of witness Mason’s testimony despite corroborative documents, and more receptive to what the court labeled Stiegler’s uncorroborated, dubious testimony. Disagreement with a credibility determination is not grounds for recusal, Diamond said.
He cited Supreme Court and circuit authority holding that opinions formed on facts and events in the current proceedings do not support a bias motion unless they show deep-seated favoritism or antagonism making fair judgment impossible. Other DAO arguments, he wrote, did not warrant discussion. He denied the recusal motion as frivolous.
The reconsideration request fared no better. Diamond noted that the DAO did not discuss or even mention the burden and criteria a party must meet to win reconsideration. Instead, as with recusal, the office urged him to revisit rulings because it disagreed with them.
That disagreement, he wrote, does not warrant reconsideration. He declined to walk through every protest aimed at his rulings, his credibility determinations, and his reference to the District Attorney’s silence in the face of damning testimony from his own employees and a former employee.
The judge again denied the motion and labeled it frivolous.
Diamond’s operative acts are clear on the public record described in the package: Krasner and Stiegler are disqualified from further participation in the case, the matter stands referred to the Department of Justice for investigation, and both the recusal and reconsideration bids are denied.
Authorities have not publicly confirmed in the materials here whether the Justice Department has opened a full criminal inquiry, assigned prosecutors, or reached any charging decision. Investigators would need to test the supervisors’ account, any competing evidence, and whether directives to mislead the court or threats tied to truthful disclosure can be proved beyond a courtroom credibility fight.
The judge underscored that Krasner may yet have the chance to testify under oath in another forum. He also wrote that the choice to avoid sworn testimony while relying on an unsworn declaration whose credibility the court could not assess makes investigation even more necessary.
Diamond closed the merits discussion with a blunt summary of the testimony he credited and the institutional stakes:
"Four of the District Attorney’s supervisors offered powerful, unrebutted testimony that their boss and Stiegler urged them to misrepresent to this Court. When the Four told the District Attorney that he had thus created a conflict compelling them to inform the Court and withdraw from this case, he threatened them with “consequences.”"
He added that few attorney transgressions cut deeper than lying to the court, pressing others to do so, or threatening them for telling the truth, especially after multiple courts had already condemned similar DAO conduct. Disqualification and referral, he concluded, were reasonable and warranted. Intemperate filings, he said, supplied no basis for recusal or reconsideration.
The order keeps Diamond on the case, removes Krasner and Stiegler from it, and parks the misconduct allegations with federal investigators. The documents do not state a conviction. The live public record is a federal judge’s disqualification order, a DOJ referral grounded in supervisor testimony the court found credible, and a flat rejection of the office’s effort to force the judge off the matter.
For Philadelphia residents and for any defendant whose liberty turns on DAO representations, the stakes are basic. Courts must be able to trust what prosecutors tell them. When supervisors swear their leaders pushed false statements and threatened “consequences” for resistance, and when a federal judge answers with disqualification and a criminal referral, the system’s integrity becomes the story.
Diamond’s message to the office was procedural as much as personal. Disagreement with rulings is not bias. Silence under oath is a choice with consequences. And a motion built mainly on heat, in his telling, does not erase testimony the court has already found powerful and unrebutted.
When a city’s top prosecutor is accused by his own supervisors of leaning on them to mislead a court, the test is not media spin or unsworn damage control. It is whether equal rules, sworn truth, and real accountability still apply to the people who wield the charging power.
