Vice President Kamala Harris' presidential campaign said it was notified by the FBI last month that it was "targeted by a foreign actor influence operation," a NBC News reporter said on Tuesday.
"We have robust cybersecurity measures in place, and are not aware of any security breaches of our systems resulting from those efforts," the campaign said, according to the reporter.
The FBI said on Monday that it was investigating after Harris' Republican rival Donald Trump's presidential campaign said it was hacked.