The claim comes amid reports of foreign efforts to interfere in the US presidential election.
US presidential candidate Donald Trump has accused Iran of hacking his campaign.
The Republican candidate's campaign issued a statement on Saturday night alleging that the Iranian government had stolen and distributed confidential internal documents. The accusation came after Microsoft published a report detailing foreign attempts to interfere in this year's US election campaign.
The campaign cited past tensions between Trump and Iran but provided no direct evidence.
“These documents were illegally obtained from foreign sources hostile to the United States, with the intent to interfere in the 2024 election and sow chaos throughout our democratic process,” said campaign spokesman Steven Cheung.
On Saturday night, Trump posted on his Truth Social app that Microsoft had informed the campaign that Iran had hacked one of its websites, but said they “were only able to obtain publicly available information.”
A Politico report published shortly before the indictment said an anonymous source had offered to provide the US outlet with internal documents from Trump's operation, including a report on the “potential vulnerabilities” of his running mate JD Vance.
A National Security Council spokesman said in a statement that it takes any reports of foreign interference “extremely seriously” and condemns any entity that attempts to undermine American democratic institutions.
Microsoft’s report said that “foreign malign influence on the 2024 US election started slowly but has steadily gained momentum over the past six months, initially due to Russian operations, but more recently due to Iranian activity.”
Iran’s permanent mission to the U.N. in New York said in an email that “the Iranian government does not possess or harbor any intention or motive to interfere in the U.S. presidential election.”
“We give no credence to such reports,” he said in response to the Trump campaign's allegations.
Iran's mission to the UN told Reuters news agency that its cyber capabilities were “defensive and proportionate to the threats it faces” and that it had no plans to launch such cyberattacks.
Tehran has poor relations with Trump. During his presidency, the United States killed Iranian military commander Qassem Soleimani in 2020 and withdrew from a multilateral nuclear deal with Iran.
“Iranians know that President Trump will stop his reign of terror just as he did in his first four years in the White House,” Cheung said.
The suspect in the attempted assassination of Trump in July had no ties to Iran, but a CNN report last month claimed US intelligence had uncovered an Iranian plot against Trump. Iran denied the allegations.
Last week, the US Justice Department unsealed criminal charges against Pakistani national Asif Merchant, who has ties to Iran and allegedly plotted assassination attempts against political figures in the United States, including Trump.
