Kolkata: Prime Minister Narendra Modi on Sunday called on Ramakrishna Math and Ramakrishna Mission president Swami Atmasthanand who is ill and undergoing treatment at a hospital here. On the campaign trail for the West Bengal assembly polls, Modi met the ailing chief monk at Ramakrishna Mission Seva Pratisthan, a hospital run by the Mission in Kolkata. Their camaraderie goes back to the early life of Modi when he wanted to become a monk of the order founded by Ramakrishna Paramhamsa. Atmasthananda, who was then posted in Gujarat, suggested to Modi to look for some other career. During the day, Modi addressed rallies in Krishnanagar in Nadia district and at the Shahid Minar Ground in the city.