Chicago Prosecutors Withdraw From Contempt Probe Case
Two Justice Department attorneys move to exit a case involving potential misconduct allegations in Chicago federal court.
Updated on Oct. 30, 2026 in Criminal Justice
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Assistant U.S. Attorneys Diane MacArthur and Nathaniel Whalen filed motions to withdraw from a high-profile case on October 24, 2026. This follows an ongoing investigation by U.S. District Judge April Perry into potential criminal contempt and lack of candor within the Chicago U.S. Attorney's office.
Why it matters
The investigation centers on allegations that federal prosecutors concealed material facts regarding outside communications during the prosecution of six protesters. These developments challenge the integrity of the U.S. Attorney's office and its transparency with the court.
Charges against 6 protesters were dropped on May 21, 2026, following revelations of grand jury misconduct. Judge April Perry is currently reviewing the withdrawal motions while investigating claims of criminal contempt.
The players
Diane MacArthur
She is an Assistant U.S. Attorney who filed a motion to withdraw from the case on October 24, 2026.
Nathaniel Whalen
He is an Assistant U.S. Attorney who joined the motion to withdraw from the proceedings.
April Perry
She is a U.S. District Judge overseeing the investigation into potential criminal contempt by federal prosecutors.
Sheri Mecklenburg
She is a former Assistant U.S. Attorney who resigned and alleged that the office's leadership bypassed standard prosecutorial objections.
Andrew Boutros
He is the U.S. Attorney who allegedly directed the protest prosecution despite internal objections.
The details
The controversy erupted after prosecutors erroneously claimed in March 2026 that no outside communications occurred, only to later admit to a meeting with Justice Department officials in September 2025. Former prosecutor Sheri Mecklenburg previously alleged that U.S. Attorney Andrew Boutros personally directed the case despite her objections.
Timeline
September 27, 2025: A virtual meeting occurs between Chicago prosecutors and Justice Department lawyers.
February 2026: Former Assistant U.S. Attorney Sheri Mecklenburg withdraws from the case.
March 30, 2026: Prosecutors erroneously file a claim stating no outside communications existed regarding charging decisions.
May 21, 2026: Charges are dropped against six protesters due to apparent grand jury misconduct.
October 24, 2026: Assistant U.S. Attorneys Diane MacArthur and Nathaniel Whalen file motions to withdraw.
Legal Context
This case highlights ongoing challenges surrounding the Brady disclosure rule and the ethical requirements for federal prosecutors. The investigation follows a broader trend of increased judicial scrutiny toward federal offices regarding the concealment of material evidence.
The potential criminal contempt finding may impact local court procedures and the oversight of federal prosecutors in Chicago. Residents should monitor for updates on whether an independent prosecutor will be appointed to handle future cases.
The takeaway
Maintaining transparency and honesty in court filings is essential for preserving the legitimacy of the federal judicial system. Failure to disclose material facts can lead to the dismissal of charges and severe disciplinary scrutiny for the offices involved.
What happens next
Judge April Perry will require the government to submit a brief concerning the appointment of an independent prosecutor by November 2, 2026, and is scheduled to hear arguments on the withdrawal motions on November 5, 2026.
Further reading
Learn more about local legal proceedings in the Criminal Justice section.
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