"I felt like this was going to be a very hard life for both of them", said Marian Shields Robinson, who moved with the first family to Washington when Mr. Obama took office.
Roberts asked if her comment was directed at Trump, who was a real estate mogul without any political experience before seeking the presidency as the crowd applauded and the two women jokingly blamed each other for bringing up the president.
"Anybody who feels the passion to get in this race, we need them in there", Obama said.
She writes in Becoming that his "loud and reckless innuendos" about her husband's birth certificate stirred people up and put "my family's safety at risk". "And for this", she adds, "I'd never forgive him".
An earlier version of this article said incorrectly that Michelle Obama will be at 57th Street Books.
In her new memoir "Becoming", Obama wrote about struggling to smile during the inauguration. "I remind myself the dignity and decency I've seen in people throughout my life, the many obstacles that have already been overcome", she admits.
On the event page for a previously announced midnight release party for the book, the Seminary Co-op highlighted Obama's South Side roots and her membership at the Seminary Co-Op.
She described how her dad would complain to her mother that she wasn't teaching her children how to wash socks, because he had had so few socks growing up that he had to wash them and dry them on a radiator himself.
She also talked about how she and her husband turned to marriage counseling, which helped the pair learn how to talk through their disagreements. Realizing it, I made my own optic adjustment: "I stopped even trying to smile". "It doesn't necessarily mean you're operating from a place of results", she explained. It topped Amazon.com's best-seller list throughout the weekend.
Fourteen thousand people purchased tickets to Obama's United Center appearance Tuesday night, with ticket prices ranging from just under $30 to hundreds or even thousands of dollars for VIP packages.
The 54-year-old is touring around the USA and will also head to London for her book tour, which will end in the middle of December. No tickets are available online for some stops.