Despite the Army demanded to reject the conclusion of the treaty of London Naval Conference on Disarmament, at the Imperial Diet opened in the latter half of April, because the proportion of the auxiliary ships unreached to 70 percent comparing to that of the United States, the government concluded the treaty, so that Tsuyoshi INUKAI, the President of the Opposition Rikken seiyukai, and Ichiro HATOYAMA attacked the government at the House of Representatives appealing 'The conclusion of the treaty ignoring the opposite opinion given by the Army means the interference and violate of supreme command,' and following that the Chairman of the Privy Council Yuzaburo KURATOMI showed his attitude to sympathize with that.
4月下旬に始まった帝国議会において、ロンドン海軍軍縮会議締結に対し、軍令部が要求していた、補助艦の対米比7割に満たないとして条約締結拒否を言ったにもかかわらず、この条約を結んだことを理由に、野党の立憲政友会総裁の犬養毅と鳩山一郎が衆議院で、「軍令部の反対意見を無視した条約調印は統帥権の干犯である」と政府を攻撃、続いて枢密院議長倉富勇三郎もこれに同調する動きを見せた。