Hours after CBI chief Alok Verma resigned following his removal from the top post by a panel led by Prime Minister Narendra Modi, and a Delhi court asked the agency to investigate its number 2 Rakesh Asthana in a bribery case, former UP chief minister Akhilesh Yadav quipped "who will investigate the CBI?" "There are so many fights happening within the CBI, so many allegations and counter-allegations... Who will probe the CBI?" the Samajwadi Party chief said amid reports that he will be questioned by the CBI in the sand mining scam.