Washington, DC (CNN) President Donald Trump's former top Russia adviser is warning that President Vladimir Putin has America "exactly where he wants us."

"Putin, sadly, has got all of our political class, every single one of us, including the media, exactly where he wants us. He's got us feeling vulnerable...on edge, and he's got us questioning the legitimacy of our own systems," Fiona Hill told CBS' Lesley Stahl in an interview set to air on "60 Minutes" Sunday.

The interview marks the former top White House official's first since testifying in the impeachment inquiry into Trump. During congressional hearings in the inquiry, Hill warned that the Republican defense of the President -- by peddling Ukraine conspiracy theories -- was in danger of extending Russia's meddling in the 2016 US presidential election

Hill, who left the Trump administration last summer, has studied Russia for decades and is a critical biographer of Putin, authoring or co-authoring a number of books on Russia, including two editions of a book titled "Mr. Putin: Operative in the Kremlin.

In the interview, Hill said Russia understands how to exploit American divisions.