Jackson Cosko is accused of posting private information of several Republican U.S. senators on Wikipedia.
Authorities say he published that information during the controversial Brett Kavanaugh hearings last week.
Jackson Lee said that intern in her D.C. office is now a former intern. He was fired as soon as she found out he was facing charges.
"Our office, our permanent staff, had nothing to do with this behavior and we condemn it," said the congresswoman.
Investigators say Cosko posted five senators' home addresses and personal cell phone numbers online.
Cosko allegedly shared that private information on the day Supreme Court nominee Kavanagh and his accuser Christine Blasey Ford testified before the Senate Judiciary Committee.
"This is a sad, unfortunate act, and it is a criminal act and it shouldn't be condoned," said Jackson Lee.
The congresswoman says her office is popular with interns and its doors will stay open as long as they obey the law.