Michelle Obama details why she'll never forgive President Trump

In her memoir, the former first lady said she was worried about her family after he and others questioned Barack Obama's birth certificate.
1:33 | 11/09/18

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Transcript for Michelle Obama details why she'll never forgive President Trump
Next tonight here, the ABC news exclusive. Robin Roberts, one-on-one with Michelle Obama. Revealing to robin her onetime personal struggle. Reporter: Former first lady Michelle Obama says she's opening up about her difficulties getting pregnant to help others. It's a struggle that many couples go through, fertility. Yes. Reporter: And you wrote about a miscarriage. I felt lost and alone. And I felt like I failed because I didn't know how common miscarriages were, because we don't talk about them. Reporter: It was with the help of infertility treatments that Malia, and then Sasha, were finally conceived. And I realized that, as I was 34 and 35, we had to do ivf. Reporter: In "Becoming," Michelle also writes about a time period a few years after they moved into the white house, when she was particularly worried for her family's safety. Donald Trump and other so-called birthers were questioning whether her husband was an American citizen, something she describes as "Mean-spirited" and "Dangerous." What if someone with an unstable mind loaded a gun and drove to Washington. What if that person went looking for our girls? Donald Trump, with his loud and reckless innuendos, was putting my family's safety at risk. And for this, I'd never forgive him. The robin Roberts interview on "20/20," "Becoming Michelle," airing Sunday night at 9:00 P.M.

This transcript has been automatically generated and may not be 100% accurate.

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