Hillary Rodham Clinton says she knows she has a decision to make about running to become the first female U.S. president, and believes "we need to break down that highest, hardest glass ceiling in American politics."

The former secretary of state tells People Magazine that she wants to enjoy the moment — she's about to become a grandmother — as she considers "what I think is right for me." But she says many Americans think the nation has "unfinished business" in sending the first woman to the White House.

"I'm certainly in the camp that says we need to break down that highest, hardest glass ceiling in American politics," the former first lady said. "To have a woman president is something I would love to see happen, but I'll just have to make my own decision about what I think is right for me." 

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Hillary Clinton is on the cover of this week's People magazine and in an interview the former secretary of state says the glass ceiling in politics needs to be broken but she hasn't decided if she will run for president in 2016. (People)

A glass ceiling is a solid but invisible barrier against women's advancement in business and other institutions.

The interview was posted a few days before the release of Clinton's new book on her four years as President Barack Obama's secretary of state. She tells People Magazine that she remains "concerned about what I see happening in the country and the world." She says she will consider her future in the coming months, with "the extra joy of "I'm about to become a grandmother."'

In the interview, she described a life partially removed from politics after spending the past two decades in the public eye. She and her husband, former President Bill Clinton, "totally binge-watched" the Netflix political show "House of Cards" and she has done water aerobics and yoga in her spare time.

Clinton said she did not make time to read the recent essay written by former White House intern Monica Lewinsky, saying she had "moved on." Asked if she regretted calling Lewinsky a "narcissistic loony toon," Clinton said she was unwilling to talk about the scandal that nearly brought down her husband's presidency.

"I'm not going to comment on what did and didn't happen. I think everybody needs to look to the future," Clinton said.

Mrs. Clinton said her husband's health has been good. "He's had that tremor for years — it's nothing serious, just some sort of nerve pinch. People say that he's too thin. He doesn't think so, and he has an enormous amount of energy."