Today the Capitol Police announced an arrest of a man they say was behind the doxing of Republican senators at the height of the Kavanaugh confirmation battle.

Initially suspicion was directed to the offices of Rep. Maxine Waters (D-Calif.), but Capitol Police investigated and reported her staff was not responsible.

Jackson A. Cosko, 27, of Washington, D.C., was arrested today for witness tampering, making threats, unauthorized access of a government computer, identity theft, second degree burglary, and unlawful entry.

He is listed as a staffer for Sen. Margaret Hassan (D-N.H.), although Fox News reports he most recently worked for Rep. Sheila Jackson Lee (D-Texas).

Jackson Cosko

"The investigation will continue and additional charges may be forthcoming," the Capitol Police report.

The man, according to his LinkedIn profile, is a "Democratic political professional" and "cybersecurity graduate student."

Cosko has worked in Democratic politics since before graduating George Washington University in 2014. He interned for Generation Forward PAC, which aims to get millennials involved in progressive politics.

He's worked in Congress since 2016, alternatively as a staff assistant, press assistant, systems administrator, and legislative correspondent.

His Twitter account, previously with the handle JaxCosko, went quiet September 5th, but was previously tweeting various anti-Kavanaugh opinion pieces and tweets.