Dozens of former senior members of Israel’s defense establishment have published an open letter to Prime Minister Benjamin Netanyahu on Monday urging him to accept the nuclear accord with Iran as a “done deal,” Haaretz reported.

The letter also called on Netanyahu and his government to renew the trust with the U.S. in order to prepare for the deal’s challenges, and to “initiate a political move which will provide credibility to Israel’s support of a two-state solution.”

This, according to the letter, would enable the formation of a moderate Sunni-Western axis which will act against extremists in the region.

The group said Israel should “adopt a policy that will restore the trust and strengthen the security-diplomatic cooperation with the U.S. administration in order to prepare for the many challenges derived from the agreement,” the letter said.

The challenges were listed as monitoring the deal’s implementation, detecting violations and “formulating special defense aid for Israel to ensure its qualitative edge,” the New York Times reported.

The letter was signed by former Shin Bet chiefs Amy Ayalon and Carmi Gillon, former MK Maj. Gen. (ret.) Amram Mitzna, Brig. Gen. (ret.) Shaul Arieli, former MK Roman Bronfman, former police chief Assaf Heffetz, among others.

The letter was published as an advertisement in the print edition of Haaretz on Monday. 

Netanyahu is set to address representatives from over 100 American Jewish organizations on Tuesday via an online video feed, hoping to influence Jewish communities to take a staunch public position against the deal with Iran.

The next day, Obama will speak at the American University in Washington, where 50 years ago, John F. Kennedy spoke in an effort to convince the American people that it was possible to prevent nuclear war with Russia through diplomacy. White House Press Secretary Josh Earnest said during a press briefing on Friday that the speech is meant to explain to the American people how the Iran deal serves U.S. security interests.