Amar Singh on 6th Jan 2010 resigned as general secretary and other 2 posts from the Samajwadi Party, citing "health reasons" amid speculation over deepening differences with party chief Mulayam Singh Yadav.Singh, who is in Dubai, told over phone that he has resigned as national general secretary, spokesman and member of the Samajwadi Party parliamentary board. He faxed his resignation from all the three posts to Yadav, he said."I have resigned from all the three posts with immediate effect and I have faxed my resignation to Mulayam Singh Yadav," said the 54-year-old high-profile spokesman of the party.

After the party lost in the Lok Sabha by election in Firozabad in November, Singh had criticised Mulayam Singh Yadav. He said the defeat was because of mis management by SP chief and his family. Yadav's daughter-in-law Dimple was the SP candidate who lost to Congress nominee Raj Babbar, who was earlier with SP but later joined Congress

Even during the Lok Sabha elections, Singh's ties with the party leadership had come under strain over Jaya Pradha's candidature in Rampur which was opposed by Azam Khan, who later exited the party.

Adding fuel to the raging fire is Kalyan Singh. Having moved away from the SP recently after tying up with them during the Lok Sabha polls, he has hit out at Mulayam Singh.
"Amar Singh must decide whether he wants to continue with the SP after being insulted like this," said Kalyan Singh.