33 CFR §20.609

1. (a)A person to whom a subpoena is directed may, by motion with notice to the party requesting the subpoena, ask the ALJ to quash or modify the subpoena.
2. (b)Except when made at a hearing, the motion must be filed:
   1. (1)10 days or less after service of a subpoena compelling the appearance and testimony of a witness or the production of evidence or
   2. (2)At or before the time specified in the subpoena for compliance, whichever is earlier.
3. (c)If the subpoena is served at a hearing, the person to whom it is directed may, in person at the hearing or in writing within a reasonable time fixed by the ALJ, ask the ALJ to quash or modify it.
4. (d)The ALJ may quash or modify the subpoena if it is unreasonable or requires evidence not relevant to any matter in issue.