Shiromani Akali Dal (SAD) is doing a "historical mistake" by fielding candidate against my son Amritpal Singh from Khadoor Sahib seat, father of jailed Waris Punjab De chief said. Amritpal's father Tarsem Singh said this after SAD's candidate Virsa Singh Valtoha met Amritpal's family seeking support. Amritpal Singh is contesting election as an independent candidate.