WATCH: Trump's Homeland Security chief Kirstjen Nielsen slams 'brazen' Russian interference in 2016 election
Homeland Security Secretary Kirstjen Nielsen. Image via DHS.

On Tuesday, Secretary of Homeland Security Kirstjen Nielsen joined a long list of government officials to confirm Russian interference in the 2016 election and denounce the Kremlin's 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," Nielsen said at a cybersecurity summit in New York.

President Donald Trump has yet to admit that Russia tried to sway the election in favor of a Trump presidency—even after Russian President Vladimir Putin admitted he had hoped Trump would beat Hillary Clinton.