Former first lady Michelle ObamaMichelle LeVaughn Robinson ObamaRegina King says she'd be honored to portray Michelle Obama in a movie Michelle Obama jokes Barack's message of hope began with being late for dinner Michelle Obama does Fortnite 'orange justice' dance with Santa MORE says in her new book that she stopped “even trying to smile” during President TrumpDonald John TrumpBiden, Sanders lead field in Iowa poll The Memo: Cohen fans flames around Trump Memo Comey used to brief Trump on dossier released: report MORE’s 2017 inauguration.

Obama sat down with “Good Morning America’s” Robin Roberts in an interview released Sunday to discuss the turnover from her husband’s administration to Trump’s.

She writes in her book “Becoming” that the celebratory feel during her husband’s two inaugurations was gone when Trump was sworn into office on Jan. 20, 2017.

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“Someone from Barack’s administration might have said that the optics there were bad, that what the public saw didn’t reflect the president’s reality or ideals, ” she wrote, according to ABC. “But in this case, maybe it did.”

“Realizing it, I made my own optic adjustment,” she continued. “I stopped even trying to smile.”

Roberts pointed out that the Obamas have mostly avoided criticizing Trump since leaving the White House last year.

“I think it’s safe to say that during your husband’s presidency it was ‘No Drama Obama,’” Roberts said. “What goes through your mind when you read and hear what’s going on with this administration?"

“I said what I continue to say — being the commander in chief is a hard job,” Obama said.  “You need to have discipline. You need to read and you need to be knowledgable. You need to know history. You need to be careful with your words.”

“But voters make those decisions and once the voters have spoken, we live with what we live with,” she added.

The former first lady opened up about her criticism of Trump in her book, writing that she would “never forgive” him for spreading the “birther” conspiracy theory that her husband wasn't a natural-born citizen of the U.S. 

"The whole thing was crazy and mean-spirited, of course, its underlying bigotry and xenophobia hardly concealed," Obama writes. "But it was also dangerous, deliberately meant to stir up the wingnuts and kooks."

“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," she continues.

The in-depth interview with Roberts was released amid Michelle Obama’s promotional tour for her new memoir, which will be released on Tuesday.

In the book, she opens up about her marriage and reveals that she suffered a miscarriage 20 years ago.

The Obamas used in vitro fertilization to conceive their two daughters, Malia and Sasha.

Updated on Nov. 12 at 5:58 a.m.