WASHINGTON (AP) — Secretary of State John Kerry will be traveling to Mexico later this month, making him unavailable to testify before a congressional committee hearing on Benghazi that he has been subpoenaed to attend, the State Department said Wednesday.

Kerry will be in Mexico for two days, starting on May 21, the department said. That means he will miss the scheduled hearing that the House Oversight and Government Reform Committee has set for the same day. Committee Chairman Darrell Issa, R-Calif., last week issued a subpoena for Kerry to appear.