20 CFR 404.939: Objections to the issues.

If you object to the issues to be decided at the hearing, you must notify the administrative law judge in writing at the earliest possible opportunity, but no later than 5 business days before the date set for the hearing, unless you show that your circumstances meet the conditions described in § 404.935(b). You must state the reason(s) for your objection(s). The administrative law judge will make a decision on your objection(s) either at the hearing or in writing before the hearing.