Four Congress MPs on Monday wrote to Union Home Minister Amit Shah, urging him for a CBI probe into the suicide case of Punjab State Warehousing Corporation official Gagandeep Singh Randhawa.The letter was signed by Gurjit Singh Aujla, Charanjit Singh Channi, Dharamvira Gandhi and Sukhjinder Singh Randhawa.Will order CBI probe if all MPs write to me: ShahIt was sent after the Home Minister assured them in Lok Sabha earlier that if they formally write to him about the incident, he was willing to get it investigated by the CBI immediately.Shah gave this assurance when Aujla, the Congress Amritsar MP, raised the matter in the Lok Sabha.Bhullar had resigned on March 21, the day Randhawa had allegedly taken the drastic step. Responding to Aujla, who raised the issue in Lok Sabha, Shah said, “This is a matter pertaining to Punjab. I request all the MPs from Punjab to write to me formally that the case be transferred to the CBI. I will do it instantly,” he said.Union Minister Ravneet Singh Bittu also raised the issue in the Lok Sabha. “Today, I am acting as a resident of Punjab and not talking about politics. Randhawa had complained to his department about the threat from the state minister but no action was taken. Three days have passed, but no arrest has been made yet,” he said.