New Delhi : Prime Minister Narendra Modi on Saturday spoke to Nagaland Chief Minister T R Zeliang and conveyed his greetings on the latter’s birthday today. “Spoke to Nagaland CM Shri TR Zeliang and conveyed my good wishes on his birthday,” the Prime Minister said in a tweet. Zeliang, a Naga Peoples Front (NPF) leader, has been the Chief Minister of Nagaland since May 2014.