Former Secretary of State Colin Powell blasted Donald Trump as a "national disgrace" and criticized repeated investigations into the attack in Benghazi as a "witch hunt" in personal emails leaked online by hackers.
Powell, a retired four-star general and a Republican, confirmed the authenticity of the emails to NBC News.
"The hackers have a lot more," he added.
The contents of the emails were first reported by Buzzfeed News. It said the messages had been obtained by the website DCLeaks.com, which MSNBC reported is rumored to have ties to Russian intelligence services.
Powell called Trump a "national disgrace" and "international pariah" in a June 17 email to a former aide, saying the Republican presidential contender was "in the process of destroying himself, no need for Dems to attack him."