Why Michelle Obama Will 'Never Forgive' President Trump

The former first lady is taking on the president in her highly anticipated memoir, "Becoming."

Michelle Obama is taking on President Trump in her forthcoming memoir, but he's not taking it lying down.

In her highly anticipated memoir, “Becoming,” the former first lady writes that she'll "never forgive" Trump for his role in the birther movement conspiracy that plagued her husband, President Obama.

"The whole [birther] thing was crazy and mean-spirited,” she writes in the new book. “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.” 

Asked about her comments on the White House lawn Friday, Trump suggested that Michelle only made them to generate interest in her book.

"She got paid a lot of money to write a book and they always expect a little controversy," Trump said. "I'll give you a little controversy back, I'll never forgive [President Obama] for what he did to our U.S. military. It was depleted, and I had to fix it. What he did to our military made this country very unsafe for you and you and you."

The former first lady also opened up for the first time about suffering 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 it. We sit in our own pain. Thinking that somehow we're broken,” she wrote. “It’s important to talk to young mothers about the fact that miscarriages happen."

Michelle told ABC News’ Robin Roberts in an interview airing Sunday that she used fertility treatments to conceive Malia and Sasha Obama.

"The biological clock is real, because egg production is limited. I realized that as I was 34 and 35, and had to do IVF,” she said. 

Roberts spoke to Inside Edition about the interview. 

"People are going to learn things they never knew and the way she freely talks about infertility,” she said. “Like so many couples, they put off having children at first for their careers, and thought it would be easy ... and it wasn't."