"I don't agree with the decision in Bihar. It is unfortunate," Yadav told reporters outside Parliament.
"The mandate of the people (in 2015 Bihar assembly polls) was not for this," the Rajya Sabha member said on the JD-U breaking its alliance the Grand Alliance of RJD and Congress in the state.
Interestingly, recently, president of the Rashtriya Janata Dal (RJD) political party Lalu Prasad Yadav had urged Sharad Yadav, currently representing the state of Bihar in the Rajya Sabha, the upper house of the Parliament, to break ties with Chief Minister Nitish Kumar.
He also requested him to join "our fight" against the BJP.