"There's no doubt now that Russia has used cyber attacks against all kinds of organisations in our country and I'm deeply concerned about this," Clinton said.
"[Vladimir Putin has] let loose cyber attackers to hack into Government files, to hack into personal files, hack into the Democratic National Committee, and we recently have learned that this is one of their preferred methods of trying to wreak havoc and collect information."
But Donald Trump was quick to dismiss Clinton's Russian hacking claims, proposing a much less glamorous alternative.
"I don't think anybody knows it was Russia that broke into the DNC," the Republican nominee said. "She's saying Russia, Russia, Russia. Maybe it was. It could be Russia but it could be China, it could be lots of people. It could be somebody that sits on their bed that weighs 400 pounds. You don't know who broke into DNC."But the two candidates weren't totally opposed on cyber security.
"As far as the cyber, I agree to parts of what Secretary Clinton said," Trump said in response to his Democratic opponent.