Iran live updates: Gulf countries under attack after US completes 3rd round of retaliatory strikes

Israeli intelligence "tipped off" the U.S. to "a very specific plot" to assassinate President Donald Trump, U.S. Ambassador to Israel Mike Huckabee said on Fox News Saturday.

"This week Israeli intelligence tipped off our side to -- the president and our officials -- that there was a very specific plot that was designed to take out President Trump," Huckabee told a Fox News anchor, who asked him how the U.S. could negotiate with a country that wants to kill the president.

Huckabee said that while the issue was "pretty serious," it was important to note Iran has long threatened the U.S.

His answer on Fox News contradicted Trump, who told the New York Post that "Israel came up with nothing" when asked about the plot, first reported by the Wall Street Journal.

Huckabee said he couldn't say whether the president took a different plane specifically because of the plot when departing Ankara.

U.S. negotiators are not present in Oman for talks with Iran, a U.S. official told ABC News Saturday.

"US technical teams will not be present in Oman but will be in touch with the Omanis and Qataris as developments occur," the official said.

On Friday, a senior U.S. official had said that negotiations would resume in Oman, but did not say if U.S. teams would be physically present. Another U.S. official said they expected Iran to publicly say they’ll stop attacking ships in the Strait of Hormuz after those talks, but according to the statement from Iran’s official news agency IRNA, no such commitment was made.

Iran’s official news agency IRNA said Omani and Iranian officials discussed “mechanisms for the safe passage of ships” and stressed Oman’s position on “the use of diplomacy to prevent the escalation of tension in the region.”

-ABC News' Selina Wang

Iran's Supreme Leader Ayatollah Mojtaba Khamenei said on Saturday that avenging his slain predecessor and father was "the demand of the nation" and "must certainly" take place, according to a message released by state television.

Khamenei issued the message on the occasion of funeral ceremonies for his father, Ayatollah Ali Khamenei, held months after he was killed in the U.S.-Israeli airstrikes on February 28.

"We pledge to avenge the blood of the martyred leader and all the martyrs of these two wars from the criminal and disgraced killers," Khamenei said in the message.

-ABC News' Rashid Haddou

President Donald Trump said "1000 Missiles are Locked and Loaded and aimed at Iran," should the government attempt to assassinate him.

In a post on his social media platform, Trump said the U.S. military is "ready, willing, and able, for a one year period of time, subject to extension, to completely decimate and destroy all areas of Iran."