India, Sept. 16 -- Prime Minister Narendra Modi on Monday charged Opposition parties with shielding illegal immigrants, asserting that infiltration had caused a "demographic crisis" in eastern States like Bihar, Assam and West Bengal, making people "worried for the honour of their sisters and daughters".

Addressing a public rally in boll bound Bihar's Purnea district, the PM also recalled as how the Congress leaders compared bidis and Bihar. He referred to a tweet by the Kerala unit of the Congress, which was deleted following a controversy.

"The Congress leaders say bidis and Bihar start with B. This is a sheer insult to the State and its people. They will give a befitting reply to the Congress and its alliance partners in the coming day...