WATCH: Sec. Nielsen on election meddling:

“Let me be clear: Our intelligence community has it right: It was the Russians. We know that, they know that. It was directed from the highest levels. And we cannot and will not allow that to happen again.” https://t.co/8wox8CurG2 pic.twitter.com/DfoxYZVWjj

— NBC News (@NBCNews) July 31, 2018