Secretary of Defense James Mattis backed up President Donald Trump’s fiery message about Iran at the Hoover Institution in Stanford, California, on Tuesday.

“[Iran] cannot continue to show irresponsibility as some revolutionary organization that is intent on exporting terrorism, exporting disruption across the region,” Mattis said, reported The Hill.

Trump tweeted an all-caps message to Iran on Sunday night. (RELATED: Iran Responds To Trump’s Threatening: ‘BE CAUTIOUS!’)

“NEVER, EVER THREATEN THE UNITED STATES AGAIN OR YOU WILL SUFFER CONSEQUENCES THE LIKES OF WHICH FEW THROUGHOUT HISTORY HAVE EVER SUFFERED BEFORE. WE ARE NO LONGER A COUNTRY THAT WILL STAND FOR YOUR DEMENTED WORDS OF VIOLENCE & DEATH. BE CAUTIOUS!” he wrote.

To Iranian President Rouhani: NEVER, EVER THREATEN THE UNITED STATES AGAIN OR YOU WILL SUFFER CONSEQUENCES THE LIKES OF WHICH FEW THROUGHOUT HISTORY HAVE EVER SUFFERED BEFORE. WE ARE NO LONGER A COUNTRY THAT WILL STAND FOR YOUR DEMENTED WORDS OF VIOLENCE & DEATH. BE CAUTIOUS! — Donald J. Trump (@realDonaldTrump) July 23, 2018

“The president was making very clear that they’re on the wrong track,” Mattis said at the Hoover Institution.

Mattis was in California with Secretary of State Mike Pompeo for a meeting with Australian officials, reported The Hill.

The defense secretary discussed Iran’s role in the region.

“I think what we have to look at is the destabilizing influence that Iran has consistently displayed and demonstrated throughout the region,” he said. “We see the same kind of malfeasance down in Yemen where they’re fomenting more violence down there. We’ve seen their disruptive capabilities demonstrated from Bahrain to the Kingdom [of Saudi Arabia], and it’s time for Iran to shape up and show responsibility as a responsible nation.”

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