The executive director of the North Carolina State Board of Elections revealed Monday that state officials had uncovered a “coordinated” and “unlawful” effort to collect absentee ballots on behalf of a Republican congressional candidate in the November election.

Kim Strach, the board’s executive director, made the comments at a closely watched public evidentiary hearing in Raleigh on Monday following a monthslong investigation into election irregularities in the state’s 9th Congressional District. The state board declined to certify the race last November and could order a new election after the hearing. Republican Mark Harris currently leads Democrat Dan McCready by 905 votes in the race.