It’s not common to see a congressional subpoena served in the middle of an oversight hearing, but it happened Monday. House Oversight Chairman Jason Chaffetz, R-Utah, informed FBI special agent Jason Herring that he was being served, and had the staffer hand over the legal notice.

Herring was before the committee, trying to explain why the bureau had withheld information that Congress requested, giving the committee documents that were blacked out and keeping back others altogether.