Nitish Kumar is expected to resign as Bihar Chief Minister today, ending his party Janata Dal(United)'s two-year association with the Rashtriya Janata Dal (RJD). Mr Kumar is likely to return to an alliance with the Bharatiya Janata Party (BJP), which has already collected support letters for the JD(U) leader. The BJP and JD(U) have also finalised a seat-sharing agreement for the Lok Sabha election due in three months.