Republican US Presidential candidate Donald Trump's campaign has made a new revelation involving Iran, a month after the US Justice Department disclosed a case of an assassination plot involving Tehran.


On Saturday, the former President's campaign said that some of its internal communications had been hacked and suggested it was targeted by Iranian operatives.  


The campaign made the acknowledgement after the US news website POLITICO said it began receiving emails from anonymous accounts with documents from inside Trump's operation. 


“These documents were obtained illegally from foreign sources hostile to the United States, intended to interfere with the 2024 election,” a spokesperson from the campaign told the BBC. 


POLITICO said it has confirmed the authenticity of the documents while the BBC reported it did not independently verify the claims. 


No further details or any evidence was given by his campaign linking the document leak to Iranian hackers or the Iranian government.


Trump's campaign made the claim a day after Microsoft released a report indicating that Iranian hackers targeted the campaign of an unnamed US presidential candidate in June. 


Microsoft's Threat Analysis Centre (MTAC) said that the campaign was sent a spear phishing email, a message designed to look trustworthy in order to get the target to click on a malicious link. 


“Over the past several months, we have seen the emergence of significant influence activity by Iranian actors,” the MTAC report said. 


A spokesperson from Trump's campaign, Steven Cheung said that the hacking attempt in June mentioned in the Microsoft report "coincides with the close timing of President Trump’s selection of a vice presidential nominee".


“The Iranians know that President Trump will stop their reign of terror just like he did in his first four years in the White House,” Cheung said.


Earlier this month, the US Justice Department said that a Pakistani man alleged to have ties to Iran has been charged in a plot to carry assassinations on US soil, including potentially of former President Donald Trump.