However, he added when the situation arises for a CBI probe, the state government may consider it.

Earlier, while replying to a motion by the opposition for a debate on the alleged Rs 6,000 crore scam in the Assembly, Nitish Mishra questioned the “political motive” behind the survey carried out by Centre for Environment and Food Security only in four opposition-ruled states.

MNREGA is being executed in all states and there could be irregularities in all of them, including those ruled by the Congress, the minister said.

Not only that he also questioned the timing of the NGO in going public with the report.

“The CEFS had completed the survey in Bihar in January 2012 but sat over it for 10 months before releasing it in November,” he said.

In fact it was released on November 24, 2012 when the Nitish government was celebrating the seventh anniversary of coming to power of the NDA in Bihar.

The minister said that the report was released when Chief Minister Nitish Kumar was included in the list of top 100 global thinkers by a US-based journal, Foreign Policy. It could have been done with an intention to embarrass the NDA government in the state.

Not only that Nitish Mishra also questioned the sample survey of the performance audit to arrive at the alleged scam. There are a number of anomalies in the performance audit carried out by CEFS like the small size of sample, methodology, questionnaire and method, he said.

Earlier, there was heated exchange of words between the minister and leader of opposition in the state Assembly, Abdul Bari Siddiqui.

The opposition members then staged a walk out. Siddiqui later told the reporters that the minister lost temper when he asked a question.