[7] When the constitutional monarchy was declared, Yunus Nadi returned to Istanbul, where he worked for İkdam as a translator and Tasvîr-i Efkâr as a writer and editor.

He wrote in support of the genocide in a 1916 article for Tasvîr-i Efkâr, describing the polycommunal solidarity of the Ottoman state as having been proven “bankrupt” and commending the “clean-up of the fatherland.”[8] After the dissolution of the Chamber of Deputies, Yunus Nadi founded his own newspaper, Yeni Gün (lit.

[7][9] Yunus Nadi also served in the Grand National Assembly as the deputy for İzmir and founded the Anadolu Agency in 1920 alongside writer Halide Edip.

In 1921, he wrote that “if necessary, we will also cover Istanbul in blood from one end to the other,” and that those “miserable souls who wanted a sultan and a padishah” could “choke in their own blood.”[7] After the Treaty of Lausanne was signed on July 24, 1923, Yunus Nadi became chairman of the committee tasked with writing the new constitution, and on October 29, 1923, on the day of the establishment of the Republic, he gave a speech before the Grand National Assembly discussing its articles.

Yunus Nadi wrote in favor of the government of Bulgarian prime minister Nikola Mushanov, expressing a hope for friendship and open dialogue.

[15] With the rise of the Nazi Party in Germany, Cumhuriyet’s coverage began to trend antisemitic, with Yunus Nadi writing several pieces in 1938 about an alleged Jewish boycott of the formerly Armenian-owned Tokatlian Hotel in Istanbul.

[5][16] He was buried in Edirnekapı Martyr's Cemetery and survived by his son Nadir Nadi, who continued to operate Cumhuriyet after his father’s death.