In her new book due out Tuesday, Democratic presidential candidate Hillary Clinton says she thinks Supreme Court Justice Ruth Bader Ginsburg may have retired if Clinton had won the election.

A source who obtained a copy of the book shared a passage from Clinton's book "What Happened" that describes her interaction with Ginsburg on President Trump's Inauguration Day.

"I ran into Supreme Court Justice Ruth Bader Ginsburg, walking slowly but with steely determination," Clinton writes on page 11. "If I had won, she might have enjoyed a nice retirement. Now I hoped she'd stay on the bench for as long as humanly possible."

Clinton later describes how her exercise in an "old red barn" pales in comparison to Ginsburg's workout routine.

"I'm no match for Ruth Bader Ginsburg, however, who pumps iron and does planks and push-ups two days a week," Clinton writes on page 86. "Her regimen is daunting, mine is more forgiving. But if she can find the time and energy to exercise regularly, so can I (and you!). When I'm on the road, I have a mini exercise routine I've now done in hotel rooms across America."

A representative for Simon and Schuster, the publisher of Clinton's book, did not immediately respond to request for comment and verification of the passages.