14 C.F.R. § 1264.139
If at any time the Attorney General or an Assistant Attorney General designated by the Attorney General transmits to the authority head a written finding that continuation of the administrative process described in this part with respect to a claim or statement may adversely affect any pending or potential criminal or civil action related to such claim or statement, the authority head shall stay the process immediately. If the process is before the presiding officer, the authority head shall promptly transmit the finding to the presiding officer, who, in turn, must stay the proceeding and give notice to all parties and their representatives. The authority head may order the process resumed only upon receipt of the written authorization of the Attorney General.
14 C.F.R. § 1264.139