Former Secretary of Statesaid Monday that North Korean ruler Kim Jong Un may be "a little unhinged."
In an interview with "CBS This Morning," Rice was asked what she thinks North Korea is trying to accomplish by detaining another U.S. citizen over the weekend. She said that they're trying to send a message that they're powerful, strong and can make the U.S. suffer.
"This is not a situation that any president can tolerate," Rice said, adding that "something has to be done" to stop North Korea's nuclear ambitions.
"I think he is reckless and maybe even a little unhinged," she said, referring to Kim Jong-Un.
Rice, who's out with a new book, "Democracy: Stories from the Long Road to Freedom," said that despite Mr. Trump's comment last week that he could meet with Kim in person, she said the U.S. president can't do that.
Speaking about the election of Emmanuel Macron as the next French president Sunday, Rice called it "good news," but warned that the issues that have brought far-right, populist candidates like Marine Le Pen to the forefront still exist.
"I think we can see even centrist candidates are shifting their tones in response to the populists," she said.
She also addressed the upcoming testimony to Congress Monday by former Deputy Attorney General Sally Yates and what should be asked of her regarding the case involving former National Security Adviser Gen. Michael Flynn.
Rice said, "We do need to understand what was going on before the inauguration of the president" in January. She said it's "not unusual for transition officials to meet with foreign dignitaries and ambassadors, but she said, "You can't discuss policy and you can't discuss that you might change policy."