The embarrassing situation for the alliance happened during Question Hour in the Assembly between state Energy Minister Bijendra Prasad Yadav and Congress Legislature Party leader Sadanand Singh.
Singh, a ninth term Congress MLA from Kahalgaon in Bhagalpur district, joined the issue with BJP member Sanjay Sarawgi, who had raised a question about absence of chowkidars in gram kachahris (village courts).
The BJP member supported by Leader of Opposition Prem Kumar alleged that despite a state government order, chowkidars were yet to be made available to many village courts.
The Congress LP leader said it was true that majority of panchayats didn't have chowkidars.
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Yadav then asked Singh why was he intervening in a question of another member.
On this Sadanand Singh retorted he would not sit idle if some wrong was happening in the state.
Singh and Yadav came face-to-face for the second time when the former intervened on a question of fellow party legislator Samir Kumar Mahaseth on defective hand pumps in a village in Madhubani district.
The Congress LP leader quipped he would point out if something was wrong in the state government.
Chief Minister Nitish Kumar was not present in the House
at the time when the two ruling coalition members engaged in the spat.
JD(U), RJD and Congress constitute the grand secular alliance in Bihar, which has a strength of 178 MLAs in the 243-member Bihar House.