Watch: The Amit Shah playbook: Rebuilding NDA in Tamil Nadu | Focus Tamil Nadu

In election-bound Tamil Nadu, Union Home Minister Amit Shah has pulled off what many thought was unthinkable—bringing together sworn rivals, the AIADMK and its splinter group, the AMMK. In doing so, he has not only rebuilt a fractured NDA in Tamil Nadu but also strengthened it ahead of the elections. How did this happen?