The information was posted during an extraordinary hearing in which Supreme Court nominee Brett Kavanaugh and Christine Blasey Ford testified in front of the Senate Judiciary Committee. | John Shinkle/POLITICO Ex-Democratic staffer charged with posting senators’ private info

A man accused of "doxing" several GOP senators was caught on Tuesday night inside the office of Sen. Maggie Hassan by a Hassan staffer, who then called the police on the man, according to a person familiar with the matter.

The U.S. Capitol Police on Wednesday arrested Jackson A. Cosko, 27, for posting addresses and private information of senators, according to the police department. A former Hassan (D-N.H.) staffer, Cosko made an unauthorized entry into her Capitol Hill office on Tuesday evening which led to his arrest, the person familiar with the matter said.


Hassan's office declined to comment. Cosko most recently worked for Hassan as a “legislative correspondent/systems administrator,” according to Legistorm. Cosko left Hassan’s office in May. Cosko is due in U.S. District Court for the District of Columbia on Thursday.

The department reported that it arrested Cosko for allegedly posting “private, identifying information (doxing) about one or more United States senators to the Internet.” Cosko has been working as an intern in the office of Democratic Rep. Sheila Jackson Lee of Texas and has been fired, according to her chief of staff, Glenn Rushing.

“We’re just cooperating with law enforcement right now,” Rushing said in an interview.

Cosko graduated from The George Washington University in 2014 and previously worked for Hassan and California Democratic Sen. Barbara Boxer, who has since retired.

Last week, the Wikipedia pages of Sens. Mike Lee of Utah, Orrin Hatch of Utah and Lindsey Graham of South Carolina were altered to show their addresses, phone numbers and email address. The information was posted during an extraordinary hearing in which Supreme Court nominee Brett Kavanaugh and Christine Blasey Ford testified about Ford’s accusation that Kavanaugh sexually assaulted her in 1982. All three are GOP senators who are supportive of Kavanaugh.

Cosko has been charged with making public restricted personal information, witness tampering, threats in interstate communications, unauthorized access of a government computer, identity theft, second-degree burglary and unlawful entry. A bot that tracks edits to Wikipedia pages found that the changes were made from a computer on Capitol Hill on the House side.

“The investigation will continue and additional charges may be forthcoming,” the police said.

Cosko remained in custody Wednesday evening and was due to appear before Judge Deborah A. Robinson in the U.S. District Court for the District of Columbia on Thursday.