Talking to reporters, Nirupam alleged that BJP is yet come out of its Bihar Assembly poll defeat.
"Shiv Sena and BJP are trying to hide the failures of governance in Mumbai municipal corporation for the last two decades. When BJP doesn't have answers, they end up insulting Bihar and Uttar Pradesh. Earlier too, Fadnavis had questioned Bihar's DNA. He has "baati chokha" with North Indians only for the sake of votes," Nirupam said.
"To divert attention of the people, to cover up for their inefficiency and failures and to garner major media space ahead of the elections, these two parties are fighting against each other," he alleged.
The corrupt functioning of the civic body cannot be possible without BJP's support to Sena, he said alleging separate contests were "match fixing".
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BJP President Amit Shah said the Sena-BJP are in a friendly fight for civic polls while Minister Chandrakant Patil has said both parties will come to together after the results, Nirupam recalled.
"We are exploring legal options to take on the Chief Minister for his comments. Asking for votes is violation of a supreme court order against use of caste, region religion for seeking votes," he said.
Nirupam lashed out at Shiv Sena saying it lacked guts to pull down the BJP government in the state.
Yesterday, addressing a rally in Mumbai, Fadnavis accused Uddhav Thackeray's party of "destroying" the metropolis, and claimed that in terms of development, Mumbai now stood in the same league with Patna ("Mumbai ka vikas dekho kitna hua..Patna ke sath lake khada kar diya.