On Monday, during an interview promoting her new book, Hillary Clinton said that she would not rule out the possibility of challenging the results of the 2016 presidential election.

“I wouldn’t rule it out​,” Clinton told National Public Radio on Monday.

The interviewer, Terry Gross, seemed floored by the revelation and asked,“So what are the means, like, this is totally unprecedented in every way.”

Clinton agreed but admitted that there was no precedent for how to move forward.

–Hillary Clinton lets it all hang out about her shocking presidential loss–

“I don’t know if there’s any legal, constitutional way to do that​,” she said, adding, “There are scholars, academics, who have arguments that it would be, but I don’t think they’re on strong ground. But people are making those arguments. I just don’t think we have a mechanism.”

Clinton also insisted that even if the roles had been reversed and she had been the one to win the election, she would still want to move forward with an investigation into the Russian interference in the election.

“Let me just put it this way — if I had lost the popular vote but won the Electoral College and in my first day as president the intelligence community came to me and said, ‘The Russians influenced the election,’ I would’ve never stood for it. Even though it might’ve advantaged me, I would’ve said, ‘We’ve got to get to the bottom of this.’ I would’ve set up an independent commission with subpoena power and everything else,” she said.

The interview was part of a promotion for Clinton’s new book, What Happened, which tells the story of the election through her eyes.