All defenses, either of fact or of law, must be set forth in the answer and no other pleading in response to the petition shall be permitted. Such answer may also allege matters showing error by any county recount board or boards, or other official, tribunal, or authority not covered by such petition, and pray for an additional writ for certification of additional proceedings and records relative thereto, in which event such additional writ may be granted in the same manner, and with the same procedure and effect as the original writ.
SDCL 12-21-54