Yomiuri and Nikkei wrote that the Constitutional Democratic Party of Japan (CDPJ), the Democratic Party for the People, the Social Democratic Party, and the Reviewing Group on Social Security Policy notified both houses of the Diet on Monday of their formation of a multipartisan legislative caucus in each house. The group has 120 seats in the Lower House and 61 in the Upper House. CDPJ leader Edano stressed at a party congress on Monday that the party will join forces with other opposition parties to counter the Abe administration and seek to capture the reins of government. Yomiuri speculated that the opposition group is planning to grill the GOJ over the new trade agreement with the United States and the consumption tax hike. However, the paper wrote that it remains to be seen whether the group will be able to act in unison because there are differences between the four parties over such issues as constitutional revision and the use of nuclear power.