The DMK on Saturday alleged that there was a “complete breakdown in constitutional machinery” in Tamil Nadu following the conviction of Chief Minister Jayalalithaa in the disproportionate assets case and sought the intervention of the President and Prime Minister to restore law and order. Party chief M Karunanidhi wrote a letter marked to President Pranab Mukherjee, Prime Minister Narendra Modi, Chief Justice of India RM lodha, Union Home Minister Rajnath Singh and Tamil Nadu Governor K Rosaiah besides Chief Justice of Madras High Court, Sanjay Kishan Kaul.