A New York man who threatened to kill Representative Ilhan Omar in a hate-filled call to her office was sentenced to a year and a day in prison, the authorities said.

The man, Patrick W. Carlineo Jr., 56, of Addison, N.Y., pleaded guilty last November to threatening to assault and murder a U.S. official, and to being a felon in possession of firearms. He was sentenced on Friday, according to a statement from the U.S. attorney’s office in the Western District of New York.

Mr. Carlineo was also ordered to forfeit six firearms and hundreds of rounds of ammunition.

In the call, which was made to the representative’s office in Washington at about 12:20 p.m. on March 21, 2019, Mr. Carlineo repeatedly spoke about violence against Ms. Omar, a Democrat from Minnesota who is one of the first Muslim women elected to Congress and wears a hijab on the House floor.

A leading voice in the Democrats’ progressive wing, Ms. Omar is also a prominent critic of President Trump, and in July 2019, she was one of four congresswomen who he said should “go back” to the countries they came from.