Lawyers for suspected assassin Luigi Mangione, an Ivy League graduate accused of gunning down Brian Thompson, the CEO of UnitedHealthcare in New York City, have filed a motion in federal court asking the judge to block the Justice Department from pursuing the death penalty if he is convicted.

Mangione’s lawyers argued that the federal case, which was filed after New York prosecutors leveled their own murder and terrorism charges against him, is “arbitrary and capricious” and that the directive for U.S. attorneys to seek capital punishment is politically motivated. 

In a second argument, they also took issue with a Justice Department Instagram post in which the language suggested that Mangione has already been convicted of the charges — he has not — and that such language prejudiced the grand jury process, which could still be underway with the deadline to file an indictment coming next week.

Mangione is accused of plotting the assassination in order to sow terror in the health insurance industry, which he allegedly railed against in a journal police seized during his arrest in Pennsylvania days after the shooting.

Luigi Mangione shouts while officers restrain him as he arrives for his extradition hearing at Blair County Courthouse in Hollidaysburg, Pennsylvania, on Dec. 10, 2024. (David Dee Delgado for Fox News Digital)

His lawyers are asking the court to take away the potential death penalty as an option if he is convicted, to order grand jurors to be screened for potential prejudice, to order Bondi to confirm she is aware of rules governing extrajudicial statements, and to inspect internal Justice Department documents as well as communications between the government and “anyone advocating for the death penalty” on behalf any business, corporate interest or lobby. 

Nicholas Biase, the chief of public affairs for the U.S. Attorney’s Office for the Southern District of New York, declined to comment on the new defense filing.