Hayden Haynes, chief of staff to House Speaker Mike Johnson, was arrested late Tuesday night for drunk driving on Capitol grounds after President Donald Trump’s joint address, the speaker’s office confirmed.

U.S. Capitol Police said in a statement to HuffPost that “a driver backed into a parked vehicle last night around 11:40 p.m.,” causing minor damage.

“We responded and arrested them for DUI,” a spokesperson said. The parked vehicle was a Capitol Police car, according to NBC News, which first reported the arrest.

Haynes is a longtime aide to Johnson, having joined his congressional campaign in 2016 from Louisiana.

The incident came after Haynes’ boss presided over the House floor during Trump’s record-breaking speech, which ran over 90 minutes and ended around 11 p.m.

Johnson showed his support for Haynes in a statement provided to HuffPost.

“The Speaker has known and worked closely with Hayden for nearly a decade and trusted him to serve as his Chief of Staff for his entire tenure in Congress. Because of this and Hayden’s esteemed reputation among Members and staff alike, the Speaker has full faith and confidence in Hayden’s ability to lead the Speaker’s office,” read the statement provided by Johnson spokesperson Taylor Haulsee.

As noted by NBC News, most crimes in Washington are prosecuted by the U.S. attorney’s office for the District of Columbia, occupied by a conservative activist, but DUI charges are prosecuted by the D.C. attorney general’s office. That office is currently led by Brian L. Schwalb, a member of the Democratic Party.