The ministry of external affairs sent a mutual legal assistant request to the United states to probe the Sikhs for Justice's 'Referendum 2020'. "We've issued a Mutual Legal Assistance Request to USA for investigation in the matter of Sikhs for Justice/Referendum 2020. As per procedure, the request has been sent directly by the concerned authorities to the US Department of Justice (DoJ)," Anurag Srivastava, MEA Spokesperson, said.