The FBI is reportedly proving an attempted cyberattack by overseas hackers against the Trump Organization. Chip Somodevilla/Getty Images

The FBI is reportedly investigating an attempted cyberattack by overseas hackers on the Trump Organization.

President Donald Trump's sons, Donald Jr. and Eric, who took charge of the company after their father took office, were summoned to an emergency meeting with the bureau's cybersecurity agents and CIA representatives, ABC News reports.

The meeting took place at the FBI's New York headquarters on 8 May, a day before Trump's controversial firing of FBI director James Comey, anonymous law enforcement officials told ABC News.

Sources said that the meeting focused on a suspected cyberattack targeting the international real estate holding companý's computer systems.

Details regarding how or when the attempted hack occurred, who were the perpetrators, or where the attack originated from are still unclear.

Eric, Trump's younger son and executive vice president of the Trump Organization, denied that the family company was breached.

"We absolutely weren't hacked," Trump told ABC News. "That's crazy. We weren't hacked, I can tell you that."

Richard Frankel, a retired senior official with the FBI's New York office said if there was an attempted cyberattack targeting Trump Organization, it would be "at the top of the list of investigations."

"If the FBI saw that kind of hack, they'd have to track that," he said. "There's no telling what a hacker could get that's connected to the president, corporate records, financial records, even things that were going on during the transition."

The attempted intrusion comes amid the FBI's ongoing probe into Russian meddling in the 2016 presidential election and allegations of collusion between Moscow and Trump's campaign.

In a statement to the New York Times, Trump Organization spokeswoman Amanda Miller suggested that the company has been targeted by cyberattacks in the past as well.

"Like virtually every other company these days, we are routinely targeted by cyberterrorists whose only focus is the inflict harm on great American businesses," Miller said.

"To be clear, the Trump Organization was not hacked. While we will remain vigilant in fighting off any attempts to do so, we are confident in the steps we have taken to protect our businesses and safeguard our information."

Last week, an investigation found digital security severely lacking in several properties linked to Trump and extremely vulnerable to hacking.

The Wi-Fi networks at Trump's Mar-A-Lago resort, Trump International Hotel in Washington DC, Trump National Golf Club in Virginia and Trump National Golf Club in New Jersey were found with weak, outdated or absent security settings.