A former Capitol Hill staffer accused of doxxing Senators during the Brett Kavanaugh nomination hearings pleaded guilty Friday to five charges, including witness tampering and computer fraud.

Jackson A. Cosko, 27, of Washington, D.C., pleaded guilty in federal court to two counts of making public restricted personal information; one count of computer fraud; one count of witness tampering, and one count of obstruction of justice. Cosko posted the cell phone numbers and home addresses of senators onto the web from House and Senate computer networks.

In documents submitted as part of today’s plea, Cosko admitted that he was angry about being fired in May 2018 as a systems administrator in Sen. Maggie Hassan’s office. Between July and October 2018, he “engaged in an extensive computer fraud and data theft scheme,” according to a statement from Alessio D. Evangelista, the Acting U.S. Attorney in this case, and Matthew Verderosa, Chief of the U.S. Capitol Police.

Cosko could face more than two years in prison. His plea agreement requires him to forfeit computers, cellphones and other equipment used in the crimes.

Sentencing is set for June 13, 2019.