A federal judge sentenced a New York man to 18 months in prison on Monday for threatening to kill two U.S. senators who supported Brett Kavanaugh’s confirmation to the U.S. Supreme Court. Prosecutors sought an even longer sentence for Ronald DeRisi, saying he went to great lengths to mask his identity and researched the senators’ home addresses and personal phone numbers. Sen. Chuck Grassley, of Iowa, has identified himself as one of the victims in the case. The staff of Sen. Susan Collins of Maine confirmed Monday to The Associated Press that she also received threatening messages from DeRisi.