Luigi Mangione's lawyers fighting against death penalty charge

Lawyers for Luigi Mangione are trying to take the death penalty off the table in his federal case for allegedly killing United Healthcare CEO Brian Thompson, claiming officials' prejudice against Mangione make it "impossible" to get a fair trial.

SUGGESTED: What state, federal charges does Luigi Mangione face?

What we know:

Mangione is facing both federal and state charges for Thompson's murder in December. Federal prosecutors are seeking the death penalty.

His attorneys say that authorities have violated Mangione's constitutional and statutory rights, accusing multiple officials, including Attorney General Pam Bondi of prejudice against Mangione. They claim that prejudice makes it "impossible" for Mangione to receive a fair trial.

What they're saying:

His lawyers submitted a court filing on Saturday, citing the day Mangione was arrested and extradited to New York City, calling it a "dramatic and choreographed perp walk." 

RELATED: NY judge dismisses terrorism charges against Luigi Mangione, lets murder count stand

In the 114-page filing, Mangione's lawyers wrote that "there is a high bar to dismissing an indictment due to pretrial publicity, however, there has never been a situation remotely like this one, where prejudice has been so great against a death-eligible defendant."

The backstory:

Mangione's legal team is fresh off a victory in court from earlier this week, when a judge dismissed the two top terrorism charges against him.

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NY judge dismisses terrorism charges against Luigi Mangione, lets murder count stand

A judge dismissed terrorism charges against Luigi Mangione in NY state's case over the killing of UnitedHealthcare CEO Brian Thompson, but he kept the state's second-degree murder charges against the Ivy League graduate.

What's next:

Federal prosecutors have until Oct. 31 to respond to Mangione's lawyers. Mangione also has a federal court date in December.

The Source: Information in this story is from a federal court filing and previous FOX 5 NY reports.

Luigi Mangione TrialCrime and Public Safety