Singh has written to the two MPs asking them to clarify their stand on the charges. He has given them a week to reply and if they fail to give a satisfactory answer, the party will move against them in the Lok Sabha under the anti-defection law.
RLD has five MPs in the 540-member Lok Sabha.
The two leaders have been speaking against RLD and their proximity to Samajwadi Party has grown in the last one year. Baghel has reportedly been declared the SP candidate from Agra reserved constituency for the forthcoming Lok Sabha elections, the RLD said.
Nagpal had shared the dais with SP leaders at programmes of the ruling party in Uttar Pradesh. The two have spoken against RLD and its chief. They have not denied reports in the media which quoted them speaking against the party.