Maurya had last week quit the BSP charging Mayawati with auctioning tickets for the elections.
Claiming the support of over 10 sitting BSP MLAs, he said they were in touch with him and will come out in the open at an opportune time.
At the meeting, 25 to 30 former MLAs, MPs and ministers who had either quit or been expelled by BSP, were present on the dais.
Addressing them, Maurya was equally critical of both the Samajwadi Party and BJP.
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Launching a sharp attack on BSP chief Mayawati, he said there will be a full-scale war.
Maurya took a dig at Mayawati saying she had the wrong impression that only she could fill up the biggest rally ground in the state capital -- Ramabai Ambedkar Maidan.
"We will hold a rally on September 22 and all will come to know that it is not just Mayawati who can hold a massive rally," he said.
Besides some BSP MLAs who had been recently expelled by Mayawati, some others who claimed that they had been given tickets for the coming polls after "complying with all the conditions" and their tickets were later withdrawan, were also present in the meeting.