New Delhi, Jan 26 (ANI): Prime Minister Narendra Modi on Tuesday greeted the nation on the occasion of India's 67th Republic Day and hailed the contribution of those who framed the Constitution. "Republic Day greetings to all my fellow Indians. Tributes to all great personalities who framed our Constitution. I salute Dr. Ambedkar for his efforts as Chairman of Drafting Committee," the Prime Minister tweeted. The nation is celebrating its 67th Republic Day today and the main function will be held at Rajpath in the national capital where President Pranab Mukherjee will take salute of the parade and French President Francois Hollande will preside as the chief guest.