He accused “populist politicians seeking to garner votes” of “provoking these tendencies,” without singling any figure out, and condemned “prejudice, the ignorance, the bigotry as well as the attempts of marginalizing toward migrants, particularly Muslims.”

The Turkish leader described the surge in hate crimes as “a raging insanity” for which the world bore responsibility.

Mr. Erdogan, who has himself embraced autocratic and populist policies in more than 15 years in power, said that leaders today had a duty “to adopt an inclusive public rhetoric to eradicate this foe once and for all.”

“This scourge can only be defeated by the common will,” he said.

Mr. Erdogan noted that Turkey had welcomed millions of refugees from Syria, suggesting that his country was leading the world in this push. (Turkey has also pushed for resettling thousands of refugees in a swath of Syrian territory controlled by the United States and its Kurdish allies.)

He also denounced what he described as Israel’s territorial expansionism, renewed a call for the immediate establishment of an independent Palestinian state, and called for talks to resolve the longstanding dispute between India and Pakistan over the territory of Kashmir.

Worried that ‘miscalculation’ threatens peace, French leader seeks dialogue between Iran and the United States.

President Emmanuel Macron of France, who has been struggling to salvage the Iran nuclear agreement repudiated by President Trump last year, called on the United States and Iran to pursue negotiations. Mr. Macron also said the Sept. 14 attacks on Saudi oil facilities, which the United States and its Western allies have blamed on Iran, had heightened the risk of war.

“Now more than ever is the time for negotiations among Iran, the United States, the signatories of the J.C.P.O.A. and regional powers, centered on the region’s security and stability,” Mr. Macron said in his General Assembly speech, referring to the Joint Comprehensive Plan of Action, the official name of the 2015 nuclear deal. The attacks on Saudi Arabia, he said, showed that “peace is at the mercy of an incident, a miscalculation.”