Three of the SP MLCs, who had resigned, have already joined the BJP and he is also expected to follow suit, sources said.
"I am tendering my resignation from the Council membership. I am peeved at the treatment meted to 'Netaji' (Mulayam Singh Yadav) in the party," Bajpai told reporters after giving his resignation to Council Chairman Ramesh Yadav.
On August 4, SP MLC Dr Sarojini Agarwal resigned from the Legislative Council membership and joined the BJP.
"I had been party MLC twice due to netaji (Mulayam Singh Yadav). As he is not active in the party, I have resigned. I don't have problems with anyone in the party and I respect everyone. I felt awkward after split in the party and I did not feel like working in it," Agarwal had said.
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Earlier on July 29 during BJP President Amit Shah's visit to the state capital, two SP and one BSP MLCs had resigned and joined BJP.
The resignation of five MLCs including (four of the SP and one BSP) assumes significance as the saffron party has to soon take a decision on five of its ministers in Uttar Pradesh, including Chief Minister Yogi Adityanath, who are not members of either of the two Houses.
Besides Adityanath, Deputy Chief Ministers Keshav Prasad Maurya and Dinesh Sharma, ministers Swatantra Dev Singh and Mohsin Raza are not members of either of the two Houses.
They have to be elected to either of the House (assembly or legislative Council) in order to continue as ministers.