Yesterday, Shiv Sena, from which Raj split up a decade ago to form his own party, had spurned his offer of tie-up.
Addressing the party workers, Raj alleged that the ruling BJP wanted to separate Mumbai from Maharashtra. He also alleged that though Shiv Sena and BJP were contesting the BMC elections separately, they would come together post-polls.
He sought votes for "saving Mumbai for Marathi people".
"I think BJP and Shiv Sena are enacting a drama of contesting BMC elections separately and will form an alliance after the results," Raj said.
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Similar drama was seen in last year's Kalyan-Dombivli Municipal Corporation elections, where both the parties came together after the polls to share the power, he said.
"I have been fighting for the cause of Marathi people and that is why I am targeted. If needed, I am ready to kowtow to anybody in the interests of Marathi people," he said.
BJP nursed secret plans to separate Mumbai from Maharashtra, and Mumbai-Ahmedabad bullet train proposal was a part of this conspiracy, he said, adding that the conspiracy would materialise if the people in the city did not oppose it.