Advertisement Prosecutors: More evidence found in apartment of former Hassan staffer accused of 'doxing' Federal judge rejects pretrial release for Jackson Cosko Share Shares Copy Link Copy

A federal judge on Tuesday rejected any sort of pretrial release for a former congressional staffer accused of posting online the home addresses of Republican senators backing Brett Kavanaugh's confirmation to the Supreme Court.Magistrate Judge Deborah A. Robinson ordered that Jackson Cosko remain in custody pending trial. Prosecutors had argued that Cosko, 27, posed a flight risk. No trial date has been set yet.Cosko was arrested on Wednesday and charged with illegally accessing the personal information of five U.S. senators, and then posting that information on the senators' Wikipedia pages. He is also charged with threatening a witness who saw him in the act. The charges carry penalties of up to 20 years in prison.Cosko was formerly employed as a systems administrator in the office of Sen. Maggie Hassan, D-N.H., and allegedly used Hassan's computers to access the information.According to court documents, Cosko fled after he was caught in Hassan's office by a staffer who knew him well. A few minutes later, he allegedly sent a threatening email to the staffer who caught him."If you tell anyone I will leak it all," the email read, according to court documents.Prosecutors said investigators also found cocaine during a search of Cosko’s apartment.According to court documents, police also found a to-do list of ways to hide his alleged crimes, including backing up files, mailing backup files, burning aliases and wiping down computers.They also found a crumpled note containing a list of planned targets, along with an extensive collection of portable electronic storage devices.Cosko left Hassan's office in May 2018. A spokesman for Hassan said, "He was asked to resign for failing to follow office procedures. We did not have reason to believe that he posed a risk."Most recently, Cosko worked as an unpaid intern in the office of Rep. Sheila Jackson Lee, D-Texas.The Associated Press contributed to this report.