The central government and ruling bloc plan to extend the ongoing parliamentary session by up to around 10 days beyond June 21 to ensure the passage of controversial bills related to tighter immigration rules and increasing the defense budget, ruling lawmakers said Tuesday.

The schedule for deliberations on key bills is becoming increasingly tight as the opposition raises concerns.

"We'd like to pass as many bills as possible by the end of the session," Prime Minister Fumio Kishida said at a liaison meeting between the government and the ruling bloc Tuesday.