The Prime Minister, Dr Manmohan Singh called on the President Mrs Pratibha Devisingh Patil at Rashtrapati Bhawan this evening. <br/><br/>They discussed the internal security situation and other current issues of national and international importance. A Rashtrapati Bhavan release said, the Home Minister, Mr P Chidambaram also joined the discussion on matters relating to internal security. The meeting lasted for fifty minutes.