Iran Press/ America: "We won't be able to hold Israel back, and we won't be able to make sure that the next attack will be calibrated and targeted as the previous one," a US official told the news website.
An Israeli official said the message was passed from Washington to Tehran through the Swiss.
Israelis could respond even if the Iranian attack comes from Iraqi territory.
"It will depend on how massive the attack is and what are its results," an Israeli official told Axios.
It seems that Joe Biden intends to encourage Jewish voters to vote for his party's candidate, Kamala Harris, at this point and before the presidential election.
American Jews, who represent three percent of the nation's population, have a longstanding tradition of voting for Democrats.
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