Parties belonging to the INDIA bloc are likely to back a Congress no-confidence motion against Rajya Sabha chairman Jagdeep Dhankhar alleging partisan functioning in the Upper House, sources have said. Sources said all the INDIA bloc parties --- including Mamata Banerjee's Trinamool Congress, Arvind Kejriwal's Aam Aadmi Party and Akhilesh Yadav's Samajwadi Party that do not see eye to eye with the Congress - are expected to sign the motion.