West Bengal chief minister Mamata Banerjee on Friday slammed Prime Minister Narendra Modi, asking why he frequently compares India with Pakistan.

'Are you the Prime Minister of India or the ambassador of Pakistan? Why do you refer to Pakistan in every issue?' Banerjee said.

Banerjee, while addressing an anti-citizenship law rally in Siliguri, said it is a shame that even after 70 years of Independence, people have to prove their nationality.

'India is a big country with a rich culture and heritage. Why does the PM regularly compare our nation with Pakistan?' the Bengal chief minister asked.

She accused the BJP of 'deliberately' creating confusion over the implementation of National Register of Citizens (NRC), saying its leaders have been making contradictory statements on the issue.

'On one hand the Prime Minister is saying there will be no NRC, on the other the Union home minister (Amit Shah) and other ministers are claiming that the exercise will be conducted across the country,' she added.