Israel’s Ministry of Diaspora Affairs ordered the operation, which used fake social media accounts urging U.S. lawmakers to fund Israel’s military, according to officials and documents about the effort.

Israel organized and paid for an influence campaign last year targeting U.S. lawmakers and the American public with pro-Israel messaging, as it aimed to foster support for its actions in the war with Gaza, according to officials involved in the effort and documents related to the operation.

The covert campaign was commissioned by Israel’s Ministry of Diaspora Affairs, a government body that connects Jews around the world with the State of Israel, four Israeli officials said. The ministry allocated about $2 million to the operation and hired Stoic, a political marketing firm in Tel Aviv, to carry it out, according to the officials and the documents.

The campaign began in October and remains active on the platform X. At its peak, it used hundreds of fake accounts that posed as real Americans on X, Facebook and Instagram to post pro-Israel comments. The accounts focused on U.S. lawmakers, particularly ones who are Black and Democrats, such as Representative Hakeem Jeffries, the House minority leader from New York, and Senator Raphael Warnock of Georgia, with posts urging them to continue funding Israel’s military.

ChatGPT, the artificial intelligence-powered chatbot, was used to generate many of the posts. The campaign also created three fake English-language news sites featuring pro-Israel articles.

The Israeli government’s connection to the influence operation, which The New York Times verified with four current and former members of the Ministry of Diaspora Affairs and documents about the campaign, has not previously been reported. FakeReporter, an Israeli misinformation watchdog, identified the effort in March. Last week, Meta, which owns Facebook and Instagram, and OpenAI, which makes ChatGPT, said they had also found and disrupted the operation.

The secretive campaign signals the lengths Israel was willing to go to sway American opinion on the war in Gaza. The United States has long been one of Israel’s staunchest allies, with President Biden recently signing a $15 billion military aid package for the country. But the conflict has been unpopular with many Americans, who have called for Mr. Biden to withdraw support for Israel in the face of mounting civilian deaths in Gaza.

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