The sources said about 60 opposition MPs — including from the Congress, RJD, TMC, CPI, CPI-M, JMM, AAP, and DMK — have signed the notice. However, they said top Congress leaders who hold Constitutional posts have not signed the notice.
Congress MP Digvijaya Singh had accused the Rajya Sabha chairman of being partisan.
INDIA bloc parties had in August this year also considered submitting a notice for moving a resolution to remove the vice president from his office.