House Oversight Committee Chairman Darrell Issa (R-Calif.) on Tuesday subpoenaed four State Department officials as part of his investigation into the administration’s response to the Benghazi, Libya, diplomatic mission attack.

In a sharply worded letter to Secretary of State John Kerry, Issa wrote that State chief of staff David Wade has been uncooperative since being first approached in mid-May with the request to make 13 State Department personnel available for depositions.

“I am concerned that waiting weeks or months while the Department prepares witnesses to be interviewed creates the risk that their testimony will have been rehearsed or coached,” Issa wrote. “The Department has left me with no alternative but to issue subpoenas to compel testimony from these important witnesses.”

The witnesses work in two bureaus that were singled out for criticism in the department’s independent audit of security lapses at the U.S. mission.

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