Prime Minister Narendra Modi has expressed grief on the passing away of former Lok Sabha Speaker P A Sangma. In a tweet, Mr Modi said, Mr Sangma was a self-made leader whose contribution towards the development of the Northeast is monumental. <br/><br/>The Prime Minister said, Mr Sangma's tenure as Lok Sabha Speaker is unforgettable. Mr Modi said, his down to earth personality and affable nature endeared him to many.