 He sought re-election but was defeated by Khadga Prasad Sharma Oli, leader of Congress' former coalition partners CPN-UML.He was elected to the Pratinidhi Sabha from the Banke-2 constituency in 1991 and 1999 on a Nepali Congress ticket.1991 Pratinidhi Sabha Election Banke-2

1994 Pratinidhi Sabha Election Banke-2

1999 Pratinidhi Sabha Election Banke-2

2008 Constituent Assembly Election Banke-3

Koirala lost in the 2008 Constituent Assembly elections from Banke-3 coming in third behind the candidates of the Madeshi People's Rights Forum and the CPN (Maoist)

2013 Constituent Assembly Elections

Koirala contested the 2013 constituent assembly elections from Banke-3 and Chitwan-4, winning both races.