The State Department issued a rare “Worldwide Caution” alert on Sunday amid concerns about a heightened risk of terror attacks by Iranian sleeper cells.

A White House official told The Daily Wire they are staying vigilant and that the Trump administration will use all resources available to protect both the United States and its assets abroad.

A bulletin from the Department of Homeland Security’s National Terrorism Advisory System on Sunday warned that the “ongoing Iran conflict is causing a heightened threat environment in the United States.” The alert issued on Sunday warns American citizens overseas to “exercise increased caution,” adding that there is “potential for demonstrations against U.S. citizens and interests abroad.”

According to NBC, Iran sent a message to Trump through an intermediary at the G7 summit in Canada last week, warning that it could activate sleeper cell terror if he attacked. Trump left the summit early to return to the White House to consider his options amid the escalation between Israel and Iran at the time.

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The Department of Homeland Security cited Iran’s history of launching cyberattacks and targeting United States government officials. It added that there is a possibility of terrorists within the United States mobilizing as part of a response to Trump’s Sunday night strike on Iranian nuclear facilities.

“The likelihood of violent extremists in the Homeland independently mobilizing to violence in response to the conflict would likely increase if Iranian leadership issued a religious ruling calling for retaliatory violence against targets in the Homeland,” it said. “Multiple recent Homeland terrorist attacks have been motivated by anti-Semitic or anti-Israel sentiment, and the ongoing Israel-Iran conflict could contribute to U.S.-based individuals plotting additional attacks.”

It adds that the conflict could motivate “violent extremists and hate crime perpetrators” to attack targets that are Jewish, pro-Israel, or linked to the United States government or military.

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The bulletin expires on September 22.

White House Border Czar Tom Homan said there is a risk posed by the 1,272 Iranian nationals who illegally crossed the border during the Biden administration.

“Over 2 million people crossed that border, we don’t know who they are, where they came from, because they got away, because Border Patrol is so overwhelmed with the humanitarian crisis that Biden created that over 2 million people crossed the border and got away,” Homan told Fox News’s Maria Bartiromo on “Sunday Morning Futures.”

“That is my biggest concern,” he added. “And that’s what created the biggest national security vulnerability this country’s ever seen.”

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Following the attack on the Fordo, Natanz, and Isfahan Iranian nuclear sites, Trump warned that “any retaliation by Iran against the United States of America will be met with force far greater than what was witnessed tonight.”

On Sunday, Trump commented on the possibility of regime change in Iran.

“It’s not politically correct to use the term, ‘Regime Change,’ but if the current Iranian Regime is unable to MAKE IRAN GREAT AGAIN, why wouldn’t there be a Regime change??? MIGA!!!” he posted.

The “biggest national security vulnerability this country’s ever seen” comes from Biden-era gotaways Trump Border Czar Tom Homan said on Sunday as he warned federal officials do not have a full accounting of all the people from Iran who illegally crossed the border during the last administration.

Homan spoke about the situation after being asked by Fox News anchor Maria Bartiromo on “Sunday Morning Futures” about the potential for Iranian sleeper cells after President Donald Trump ordered strikes on Terhan’s nuclear facilities this weekend.

Citing data from U.S. Customs and Border Protection, Homan explained that there were 1,272 nationals of Iran released into the United States by immigration officials under President Joe Biden, which is a stark contrast to “zero” releases under the Trump administration.

“Under Joe Biden, there was 1,272 nationals of Iran released into the country” after crossing the border illegally, says @RealTomHoman.

“Compare that to the Trump Administration — ZERO.” pic.twitter.com/UhX6WinI0C

— Rapid Response 47 (@RapidResponse47) June 22, 2025

“Right now, because of President Trump’s leadership, we have the most secure border in my lifetime, most secure border in the history of this nation. So we have a secure border. So that was President Trump’s big win on securing this nation,” Homan said. “So we’re not releasing people into this country. Special interest aliens aren’t crossing that border undetected. But under Joe Biden, we had over 10 million people cross that border. But my biggest concern from day one, beyond the fentanyl, beyond the sex trafficking of women and children, were the 2 million known gotaways.”

He continued: “Over 2 million people crossed that border, we don’t know who they are, where they came from, because they got away, because Border Patrol is so overwhelmed with the humanitarian crisis that Biden created that over 2 million people crossed the border and got away. That is my biggest concern. And that’s what created the biggest national security vulnerability this country’s ever seen.”

Homan conceded the Trump administration does not know where all the gotaways have gone, but he expressed confidence in the leaders at the FBI, Department of Homeland Security (DHS), and White House now compared to when Biden was president.

“No, the intelligence community under President Trump has been on this since day one. What gives me any comfort at all is that you don’t have Christopher Wray there [leading the FBI]. You got Kash Patel there. You don’t have Alejandro Mayorkas there [leading DHS] anymore. You got Kristi Noem. And you certainly don’t have [former Vice President] Kamala Harris as the border czar,” Homan said.

“So President Trump brought a great team, been on this since day one,” Homan added. “Do we know where every one of the 2 million are? No. We don’t know who they all are. We don’t know why they’re here or where they came from. But we do know, Border Patrol intelligence over the last four years, they have found prayer mats south of the border. They have found identification from people from Iran, Turkey, Uzbekistan, Syria south of the border.”

Homan concluded by saying: “So we know that some terrorists have crossed that border. We’d be a fool to think zero crossed. The thing is, though, we’ve got President Trump as a commander in chief who has put all resources on that. That’s why President Trump from day one of ICE [U.S. Immigration and Customs Enforcement] operations, despite what the left media says, he has been focused on national security threats and public safety threats. And between ICE and the bureau, we have removed thousands of national security threats because of President Trump’s leadership on this.”