However Iwakura stiffened his attitude when he heard of Okuma's secret report to Imperial Prince Arisugawanomiya Taruhito, Minister of the Left, concerning the introduction of constitutional monarchy and of Okuma's proposal for the introduction of parliamentary cabinet system.
ところが、立憲制導入を巡る大隈の左大臣有栖川宮熾仁親王への密奏と議院内閣制の導入提案が岩倉の態度を硬化させた。