If the LDP and the New Komeito control two-thirds of the lower house, they could enact legislation even if it is rejected by the upper chamber, where they currently lack a majority.
Since 2007, no ruling bloc has had a majority in the upper house, which can block bills other than treaties and the budget.
However, over-riding the upper house is a cumbersome and time-consuming process, so the LDP and its ally will be aiming to win a majority in the chamber at an election in July next year when half the seats are up for grabs.
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