Iran reportedly sent a threat to Donald Trump just days before he ‘obliterated’ three of their nuclear sites, warning it would unleash sleeper cell terrorists inside the US if the country was attacked.

Trump received a communiqué from Iran just days before the US military strikes on its nuclear facilities threatening to activate sleeper-cell terror inside the United States if it were attacked, sources told NBC News.

The official message was delivered to Trump through an intermediary at the G7 summit in Canada last week.

The president left early on June 16 to consider his options amid the conflict between Israel and Iran, according to the sources.

Following his departure from the G7 summit, Trump told reporters aboard Air Force One he planned to hold ‘early’ meetings with his security team in the White House Situation Room after issuing a stunning call for people to ‘evacuate’ Tehran amid Israeli bomb attacks there. 

After the US deployed B-2 bombers to drop more than a dozen ‘bunker busters,’ Iran’s foreign minister called the strikes ‘outrageous’ and said that Tehran ‘reserves all options’ to retaliate. 

The Department of Homeland Security issued a national terrorism bulletin Sunday warning of possible cyber attacks and violence, including antisemitic hate crimes, following the strikes. 

‘The ongoing Iran conflict is causing a heightened threat environment in the United States,’ the bulletin said.

Iran delivered a message to Trump at the G7 summit last week (pictured) threatening to unleash sleeper cell terrorists if the US attacked Iran

The US ‘obliterated’ the nuclear cites, including the Fordow Fuel Enrichment Plant (pictured before the attack)

An operational timeline of a strike on Iran is displayed during a news conference with Chairman of the Joint Chiefs of Staff

Although there are ‘no specific credible threats,’ the department warned that low-level cyber attacks against US networks are likely.

‘Iran also has a long-standing commitment to target US Government officials it views as responsible for the death of an Iranian military commander killed in January 2020,’ DHS said.

‘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.’

Former FBI assistant director Chris Swecker told Fox News Digital the Joe Biden’s border crisis may have exacerbated the number of sleeper-cells in the country. 

‘Because of the open borders, we are at a serious catch-up phase. We don’t know where those thousand Iranians are and who knows how many others got across the border,’ he said.

Over 1,200 Iranian nationals reportedly entered the US during the Biden Administration, according to Trump’s border czar Tom Homan.

Swecker explained that during Biden’s tenure, the FBI focused on homegrown terrorists and lost track of foreign threats. 

‘There’s a certain population of Iranians in the U.S. that we know about, but there’s thousands and thousands that we don’t know about because of the open border situation,’ Swecker said.

The US deployed B-2 bombers (pictured) to drop more than a dozen ‘bunker busters’ at three Iranian nuclear cites

‘The Bureau was concentrating their resources on so-called domestic terrorists like white supremacists and right-wing extremists, and calling them the most serious terrorist threat to this country when it was absolutely the international terrorists that should have been the focus of the bureau’s efforts.’ 

Cities across the United States are on high alert following the airstrikes on three nuclear cites in Iran.

Police in New York City and Washington DC revealed they increasing their presence amid fears of a retaliatory attack.

The New York City Police Department said in a post to X: ‘We’re tracking the situation unfolding in Iran.

‘Out of an abundance of caution, we’re deploying additional resources to religious, cultural, and diplomatic sites across NYC and coordinating with our federal partners. We’ll continue to monitor for any potential impact to NYC.’

Not long after that post, the Metropolitan Police Department also released a similar statement.

It said: ‘The Metropolitan Police Department is closely monitoring the events in Iran.

‘We are actively coordinating with our local, state, and federal law enforcement partners to share information and monitor intelligence in order to help safeguard residents, businesses, and visitors in the District of Columbia.’