"I have no problem if someone joins the BJP but all I am saying is to do politics formally by joining them... I don't speak without evidence," Mamata said.

Days ago, the TMC supremo lashed out at Kartik Maharaj claiming he had stopped a TMC polling agent from discharging his duties in Baharampur.

"All monks are not the same... I have always respected Bharat Sevashram Sangha. But I came to know there is a monk in Baharampur, named Kartik Maharaj, who said he won't allow TMC agents to perform his work. I don't respect such a monk. I don't consider him as a monk," said Mamata.

In reply, Kartik Maharaj said, "I haven't said this. I challenge the allegation. Our organisation will protest and a case will be filed in the court."

Meanwhile, Prime Minister Narendra Modi on Sunday brought up the issue during his campaign for the BJP and accused Mamata Banerjee-led West Bengal government of minority appeasement politics.

Modi said at a rally, "The TMC government, which is known for intimidation and violence, has crossed all limits. ISKCON, Ramkrishna Mission and Bharat Sevashram Sangha are known for their philanthropic works across the world.

"But now the West Bengal Chief Minister is threatening monks of ISKCON, Ramkrishna Mission and Bharat Sevashram Sangha publicly from the stage... The Bengal government is doing this only to appease its own vote bank. The TMC has stooped down to this level for the votebank."