Sophie Roske was sentenced to just over eight years — 97 months — in prison on Friday for a 2022 attempt to assassinate Justice Brett M. Kavanaugh of the Supreme Court.

The sentence was handed down by Judge Deborah L. Boardman, of the Federal District Court for the District of Maryland, at the end of a daylong hearing at a courthouse in Greenbelt, Md.

Ms. Roske, 29, was charged under her legal name, Nicholas J. Roske. In September, her attorneys disclosed to the court that she is transgender and now uses the name Sophie.

“Violence is never a means to a political end in a democratic society,” said Judge Boardman, before delivering the sentence. “We cannot and will not tolerate it.”

Prosecutors asked Judge Boardman to sentence Ms. Roske to at least 30 years in prison for attempting to commit an act of political violence, what one called at the hearing “a very real threat to our system of government, to our Constitution.”

“No judge or public official should live under the fear of thinking that at any moment, at any given day, at any given time, that they could be killed in cold blood, simply for doing their job,” said Coreen Mao, an assistant U.S. attorney.