Rajya Sabha MP and Aam Aadmi Party (AAP) leader Sanjay Singh has given a notice to hold a discussion in the upper house on the alleged misuse of Central Bureau of Investigation. Earlier, AAP convenor Arvind Kejriwal came out in support of West Bengal Mamata Banerjee after she announced to sit on a dharna after the officials of the investigative agency swooped down on Kolkata Police Commissioner's residence over chit fund scam probe.