"Everybody knows that there has been a huge influx of people of a particular community from Bangladesh during the last four decades and certain political parties have patronised them for vote-bank politics," Singh said a rally at Karimganj in Barak Valley.
"If BJP comes to power, we'll institute an inquiry to find out how so many people of a particular community could enter the country illegally and settle down," Singh said.
"In the case of Hindus being harassed in Bangladesh and forced to flee that country, we cannot treat them as refugees, but must be sympathetic to their cause," he said.
"BJP does not believe in distinction between different religions or on division of the country on the basis of religion as was done during the time of Independence," he said.
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"BJP believes in politics of humanity and not of religion. In Assam, we make no difference between Hindus and Muslims, but illegal migrants who are a threat to the indigenous population, will not be tolerated," he said.
"Powerful countries threatened to stop economic aid and imposed sanctions, but we finally emerged strong and no country considers us weak now," Singh said.