Leaking of official secrets of military operations is treason and those involved in it must be punished, the Congress said on Wednesday on the purported WhatsApp chats of Republic TV editor-in-chief Arnab Goswami and demanded that the prime minister must come clean. The party said those involved in the anti-national act deserve no mercy and the government should immediately order an inquiry into the information leak about the 2019 air strikes. The Congress fielded its top leaders former defence minister A K Antony, leader of opposition in Rajya Sabha Ghulam Nabi Azad, former home minister Sushilkumar Shinde and former law and external affairs minister Salman Khurshid to launch a scathing attack on the government at a joint press conference.