Mulayam’s meeting with Naidu came a day after Samajwadi Party chief Akhilesh Yadav urged him to bring non-BJP parties on a single platform ahead of the 2019 Lok Sabha election.
Naidu, who met several opposition leaders in the national capital Saturday and Thursday, said he would play the role of a "facilitator" in helping evolve a credible alternative to the Bharatiya Janata Party (BJP) dispensation.
Naidu on Thursday announced its support to Congress for the upcoming Lok Sabha elections next year.
Naidu indulging in political tourism: BJP
The BJP took a dig at N Chandrababu Naidu over his meetings with several opposition leaders, saying he was indulging in "political tourism". Naidu is diverting attention from Andhra Pradesh where he is facing imminent defeat in next state and parliamentary elections.
"He comes to Delhi for political tourism and photo session," BJP spokesperson Shahnawaz Hussain said.