I have asked my family to tweet on my behalf the following: I am happy the Prime Minister has thrown the Einstein challenge to students. — P. Chidambaram (@PChidambaram_IN) 1570268285000

Albert Einstein's celebrated quote was 'Freedom of teaching and of opinion in book or press is the foundation for t… https://t.co/w1djfLVC1T — P. Chidambaram (@PChidambaram_IN) 1570268409000

When will our universities truly become havens of freedom of thought and expression? — P. Chidambaram (@PChidambaram_IN) 1570268477000

NEW DELHI: Senior Congress leader P Chidambaram on Saturday took a swipe at Prime Minister Narendra Modi over his 'Einstein challenge' to students, asking when would the country's universities become havens of freedom of thought and expression.Chidambaram, who is lodged in Tihar Jail since his arrest by the CBI, has asked his family to put out a tweet on his behalf."I am happy the prime minister has thrown the Einstein challenge to students. Albert Einstein 's celebrated quote was 'Freedom of teaching and of opinion in book or press is the foundation for the sound and natural development of any people'," he said."When will our universities truly become havens of freedom of thought and expression," he asked in a series of tweets.The prime minister, in an article written by him in 'New York Times' had proposed the Einstein challenge."As a tribute to Gandhi, I propose what I call the Einstein Challenge. We know Albert Einstein's famous words on Gandhi: 'Generations to come will scarce believe that such a one as this ever in flesh and blood walked upon this earth'," he had written." Mahatma Gandhi 's personality. The power of his thoughts. His global impact. And, a special Einstein challenge for you all," Modi had tweeted on October 2 attaching his article on the occasion of Gandhi's 150th birth anniversary.