Israel’s prime minister turned down a regional peace initiative last year that was brokered by then-U.S. Secretary of State John F. Kerry, former U.S. officials confirmed Sunday, in apparent contradiction to his stated goal of involving regional Arab powers in resolving Israel’s conflict with the Palestinians.

Benjamin Netanyahu took part in a secret summit that Kerry organized in the southern Jordanian port city of Aqaba in February 2016 and included Jordan’s King Abdullah II and Egyptian President Abdel Fatah al-Sissi. The secret meeting was first reported by the Haaretz daily.

According to two former Obama administration officials, Kerry proposed regional recognition of Israel as a Jewish state — a key Netanyahu demand — alongside a renewal of peace talks with the Palestinians with the support of the Arab countries.

Netanyahu rejected the offer, which would have required a significant pullout from occupied land, saying he would not be able to garner enough support for it in his hard-line coalition government.

The initiative also appeared to be the basis of short-lived talks with moderate opposition leader Isaac Herzog to join the government, a plan that quickly unraveled when Netanyahu chose to bring in nationalist leader Avigdor Lieberman instead and appoint him defense minister.

Herzog tweeted Sunday that “history will definitely judge the magnitude of the opportunity as well as the magnitude of the missed opportunity.”

Two former top aides to Kerry confirmed that the meeting occurred in secret on Feb. 21, 2016. According to the officials, Kerry tried to sweeten the 15-year-old “Arab Peace Initiative,” a Saudi-led plan that offered Israel peace with dozens of Arab and Muslim nations in return for a pullout from territories captured in the 1967 Mideast war to make way for an independent Palestinian state.

Among the proposed changes were Arab recognition of Israel as the Jewish state, recognition of Jerusalem as a shared capital for Israelis and Palestinians, and softened language on the “right of return” of Palestinian refugees to lost properties in what is now Israel, the former officials said.

The officials, speaking on the condition of anonymity because they were not authorized to discuss the meeting publicly, said the Egyptian and Jordanian leaders reacted positively to the proposal, while Netanyahu refused to commit to anything beyond meetings with the Palestinian leader Mahmoud Abbas.

The officials said opposition inside Netanyahu’s hard-line government, which is dominated by nationalists, presented a formidable obstacle.

Netanyahu did not address the report in his weekly cabinet meeting, and his office refused to comment.