The presidential campaign of Donald Trump says its official website has been defaced and that it is working with law enforcement to investigate the source of the attack.
The campaign said in a statement on Tuesday there was "no exposure to sensitive data because none of it is actually stored on the site".
The website seemed to be fully functional on Tuesday.
Screenshots circulating online appeared to show the site had briefly displayed a bogus message spoofing a law enforcement announcement.
The message then sought cryptocurrency donations from visitors in exchange for access to purported "internal and secret conversations" from Trump's family and associates.
The hackers provided no evidence to back their statements.
Past boasts by hackers to have inside access to Trump-related correspondence - notably by a group that claimed to have penetrated an entertainment law firm earlier this year - have come to nothing.
Australian Associated Press
