The Rajya Sabha elections were concluded in Madhya Pradesh on Friday.
SP MLA, Rajesh Shukla voted in support of the BJP.
After the party high command came to know about this, Rajesh Shukla was expelled from the party.
SP chief Akhilesh Yadav had written a letter authorizing the party's national secretary Rajendra Chaudhary to give directions to the MLA and issue a whip.
While Rajesh Shukla later said, he has personally joined BJP, he could not develop in the Kamal Nath government, he will work in BJP.