IRAN INTERNATIONAL -- In an open letter organized by the Jewish Institute for National Security of America (JINSA), the former commanders said that “it is time to let Israel finish the job against the Iranian axis and stop Iran from crossing the nuclear threshold” and urged Washington to provide military assistance.

"A nuclear Iran would be a threat to US national security," the letter reads. "What Israel seeks from the United States is support to ensure the maximum effectiveness of its actions and manage the risk of Iranian retaliation. We should provide it expeditiously."

Referring to Iran's rising enrichment and obstruction of IAEA inspectors, it said more must be done to defend the Jewish state.

“With Iran capable of producing weapons-grade uranium in just days, working toward a nuclear weapon, and building ever-deeper underground facilities, time is running out to stop its march to the bomb,” the former generals added.

While acknowledging that diplomacy is preferable, the signatories said they doubt Iran would negotiate in good faith. "Repeated negotiations with Iran over two decades have led to one dangerous result: The world’s leading state sponsor of terrorism now stands on the cusp of developing the world’s most dangerous weapons," they wrote.

In early-February, Trump declared the return of the so-called maximum pressure on Tehran, vowing to block its paths to a nuclear weapon.

"Iran remains the world’s leading state sponsor of terror," the memo read, blaming Tehran for supporting militant groups such as Hezbollah, Hamas, and the Houthis.

Secretary of State Marco Rubio, visiting Israel last week, called Iran the single greatest source of instability in the Middle East. "There can never be a nuclear Iran," Rubio said. "That can never happen."

Israeli Prime Minister Benjamin Netanyahu said during the same press conference that "Israel and America are shoulder-to-shoulder in countering the threat of Iran."