President Ram Nath Kovind was admitted to the Army's Research and Referral (R&R) Hospital in New Delhi on Friday morning owing to chest discomfort. The President, 75, complained of chest discomfort in the morning and thereafter he was rushed to the military hospital. The President, who underwent routine tests and was put under observation, is now in a stable condition, the hospital said. In a statement, the hospital authorities said: "He is undergoing routine check-ups and is under observation. His condition is stable." Sources said the President will stay in the hospital till the time the entire medical diagnosis is complete. The doctors are taking care of things, said the hospital authority. Prime Minister Narendra Modi spoke to President Ram Nath Kovind's son on Friday to enquire about his health. Kovind is undergoing check-up at the Army's Research and Referral hospital here after complaining of chest discomfort, the hospital said. In a tweet the PMO said, "PM Narendra Modi spoke to Rashtrapati Ji's son. He enquired about the President's health and prayed for his well-being."