Nitish tenders resignation as outgoing CM, presents NDA support letters to Governor, formally claiming mandate to lead new administration after assembly dissolution.
JD(U) MLAs elect Nitish as party chief at CM residence; BJP's Samrat Choudhary nominates him as NDA leader in assembly meet, passed without opposition.
Swearing-in slated for Nov 20 at Gandhi Maidan with PM Modi expected; allies Choudhary and Sinha likely deputies, as Nitish eyes media briefing on victory.