Representative Ro Khanna has known Elon Musk for more than a decade, so he thought he should raise some concerns about the billionaire’s assault on the federal government where he would be sure to see them.

Elon Musk sharply responded to Democratic Representative Ro Khanna’s criticism, telling him, “Don’t be a d.ck,” after Republicans blocked a motion to subpoena Musk over his involvement in government operations during a House Oversight Committee vote.