Michelle Obama in a candid interview with Oprah Winfrey opened up for the first time publicly about the 2016 presidential campaign, calling it “Challenging” for her “As a citizen to watch and experience.”

“So we’re going to be t for the next president and do whatever we have to do to make sure that he is successful, because if he succeeds, we all succeed,” Obama told Winfrey during her final one-on-one White House interview, which aired Monday at 8 p.m. ET on CBS. In the one-hour program, Obama reflected on her eight years as first lady, discussing topics including her surprise at being called an “Angry black woman” during her husband’s 2007 presidential campaign and Trump’s comments about women.

“My offer to Melania was you really don’t know what you don’t know until you’re , so the door is open as I’ve told her,” Obama said, adding that she’s modeling what the Bushes had done for her.

President Barack Obama also made an appearance during the interview, discussing what surprised him about how his wife filled the role of first lady.

Michelle Obama said she and her husband have grown closer in the last eight years, but added that her biggest sacrifice has been anonymity.

Toward the end, Winfrey returned to a question she had put to Michelle Obama eight years earlier, when she asked about Obama’s prayers for her family.

Obama’s response at the time, Winfrey said, was that “We remain whole.”