Rice told former Obama administration official Alyssa Mastromonaco at the 10th annual Women in the World Summit on Thursday in New York that she loves Maine and that her family has deep roots in the state.
Susan Rice says she won't challenge GOP Sen. Collins in 2020 →
"I've given this a lot of thought, and in the course of weighing it all, I've decided with my family that the timing really isn't right for us," she said.