Barack Obama ran his presidential campaign on the platform of hope for a better future, and now First Lady Michelle Obama is addressing in her last interview before leaving the White House the importance of hope once again.

In a promo for Michelle's interview with Oprah Winfrey, Michelle compared her husband's legacy to the mood of a nation facing four years of a Trump presidency.

“We feel the difference now," she said in an excerpt featured on CBS This Morning. "See, now, we're feeling what not having hope feels like."

FLOTUS, who campaigned heavily for Hillary Clinton, also said that her husband's emphasis on hope throughout his campaign and during his eight years in office wasn't just empty words.

"Hope is necessary. It’s a necessary concept and Barack didn’t just talk about hope because he thought it was just a nice slogan to get votes. He and I and so many believe that what else do you have if you don’t have hope? What do you give your kids if you can’t give them hope?"

Michelle said that ultimately, she thinks her husband will be remembered for the reassurance he provided to the American people as president, while also suggesting that perhaps that same comfort and support will not be communicated by the office in the years ahead.

"I feel Barack has been that for the nation in ways that people will come to appreciate. Having a grown-up in the White House who can say to you in times of crisis and turmoil, 'Hey, it’s going to be OK,'" she said.

Watch the full excerpt in the video below:

In another promo of the interview, Michelle also addressed race and social inequalities.

"Color, wealth, these things that don’t matter still play too much of a role in how we see one another," she said. "And it’s sad because the thing that least defines us as people is the color of our skin."

The full interview with Michelle airs Monday on CBS.

Related: Michelle Obama Reveals What She Did When Donald Trump Won the Presidency

Check this out: