New Delhi, Aug 09 (ANI): Former Prime Minister Manmohan Singh visited Army's Research and Referral hospital in Delhi to enquire about the health of Former BJP leader Jaswant Singh on Saturday. Jaswant Singh, who slipped into coma after suffering a head injury at his residence, is still critical according to reports. Singh, who was admitted to the Intensive Care Unit of the Army's Research and Referral hospital in Delhi, is on life support systems and under constant monitoring by a team of neurosurgeons and critical care providers. Earlier, Prime Minister Narendra Modi also spoke to his family members on phone shortly after he was apprised about Singh's condition.