The United States Supreme Court Rule 18 pertains to appeals from a United States District Court.  According to the rule, any party is free to file a supplemental brief while a jurisdictional statement is pending in an appeal as of right to the United States Supreme Court.  The supplemental brief may be filed to call the attention of the court to new cases, new legislation, or other intervening matter not available at the time of the party’s last filing[i].  The rule further stipulates that forty copies of such brief must be filed[ii].

A supplemental brief shall be strictly restricted to new matter.  Such brief shall follow, insofar as applicable, the form for a brief in opposition prescribed by Rule 15[iii].  Further, the supplemental brief shall be served as required by Rule 29[iv].

[i] Sup. Ct. R. 18.10.

[ii] Id.

[iii] Sup. Ct. R. 15.

[iv] Sup. Ct. R. 29.