Federal prosecutors formally filed to request the death penalty in this case earlier on Friday.
He killed Mr. Thompson, they claimed, “to amplify an ideological message” and incite opposition to the health insurance sector.
In April, US Attorney General Pam Bondi declared that Mr. Thompson’s death was “an act of political violence” and instructed prosecutors to pursue the death penalty.
Discussions on Mr. Mangione’s execution were previously deemed “barbaric” by his attorneys.
Judge Margaret Garnett made an effort to organize a pre-trial timetable during Friday’s 35-minute session, while Mr. Mangione’s attorneys persisted in objecting to his indictments on both federal and state crimes in New York.
