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President Trump. Photo: Mandel Ngan/AFP/Getty Images

President Trump tweeted Sunday if Iran wants a fight, it'd be the "official end" of the country, hours before Fox News broadcast an interview in which he said he wouldn't let Tehran have nuclear weapons.

Details: Trump tweeted after a rocket exploded near the U.S. Embassy in Iraq, "Never threaten the United States again!" No one's claimed responsibility for the attack. In an interview on Fox News' "The Next Revolution with Steve Hilton" recorded last week, Trump said he didn't want a fight. "But you do have situations like Iran, you can’t let them have nuclear weapons," he said.

The big picture: In his wide-ranging interview with Hilton, Trump stood by his decision to pull out of the Iran nuclear deal and impose sanctions on the country, saying he had no idea the effects would be as strong as they were. "The country is devastated from the standpoint of the economy," he said.

Driving the news: Although no one had claimed responsibility for the Baghdad rocket attack, in which there were no casualties, a U.S. State Department official told Reuters: "We will hold Iran responsible if any such attacks are conducted by its proxy militia forces or elements of such forces, and will respond to Iran accordingly."

What they're saying: U.S. ally Saudi Arabia said Saturday it was not looking for a war, but it was ready for one, after it accused Iran of ordering the attacks of 2 oil pumping stations in the kingdom, for which Yemen's Houthi group claimed responsibility.

The other side: BBC quoted Maj. Gen. Hossein Salami, the commander of Iran's elite Islamic Revolution Guards Corps, as saying Iran was not seeking a conflict. He also said "Washington is not brave enough to launch a war," according to the Iranian Fars news agency.

Go deeper: Trump pushes China and Iran to the brink

Go deeper

Everyone wants to be an influencer

Illustration: Aïda Amer/Axios

The number of people looking to become online influencers has exploded during the pandemic.

Why it matters: Almost anyone can find themselves in a position to become an influencer, and brands are throwing billions of dollars at online content creators.

At least 3 dead after Amtrak train derails in Montana

Photo: Jacob Cordeiro/Twitter

An Amtrak train derailed near Joplin, Montana, resulting in at least three deaths and multiple injuries to passengers and crew on Saturday, per authorities and a company statement.

The big picture: 141 passengers and 16 crew members were estimated to be on the Empire Builder train, traveling from Chicago to Seattle and Portland, when eight of the 10 cars derailed about 4p.m., Amtrak said early Sunday.

Updated 10 hours ago - Politics & Policy

Federal judge blocks vaccine mandate for NYC teachers

Students are dismissed from the first day of school at PS 133 in Brooklyn on Sept. 13. Photo: Michael Nagle/Xinhua via Getty Images

A federal appeals court is set to hear a challenge Wednesday to a vaccine mandate planned for New York City school employees.

Why it matters The vaccine mandate was set to begin on Monday, prompting concerns over staffing shortages in schools across the nation's largest school system. But a judge on Friday temporarily blocked the measure, per AP.