The vigilance department, after completing its probe against Siddiqui, Kushwaha and former secondary education minister Rangnath Mishra, had recommended lodging of FIRs against them.
Siddiqui, a BSP heavyweight and party's Muslim face, is facing charges of possessing assets disproportionate to his known sources of income. The charges were probed by the vigilance department on the directives of the UP Lokayukta, home department sources said.
The inquiry by the vigilance had found that in comparison to Siddiqui's income of Rs 69,96,809 between 1997 and 2012, his expenditures were Rs 14,32,00,609, the sources said.
In case of Kushwaha also, the Lokayukta had recommended an inquiry, following which the vigilance department had conducted an open probe and submitted its report in April this year.