Hillary Clinton said Thursday she was "disappointed" but not surprised at the Senate acquittal of President Donald Trump, praising Sen. Mitt Romney, R-Utah, for casting the "first bipartisan vote to convict in U.S. history."

In an interview on "The Ellen DeGeneres Show," the former secretary of state and 2016 Democratic presidential candidate called Romney's Senate-floor speech Wednesday "extraordinary."

"I wasn't surprised" at the acquittal "because it's hard to get 67 votes to convict and remove somebody," Clinton said. "I was still disappointed that not more of the Republicans were willing to take the stand that Mitt Romney took."

"So, now it's voters who've got to say, 'Okay, I have to take responsibility for this and follow Mitt Romney's lead,'" she said, adding, Romney's vote "was the first time in U.S. history that there was a bipartisan vote to convict."

Clinton said "the evidence was really clear."

"There was no doubt by the time it was all presented that actually the president had done what he was accused of," she said. "In fact, he admitted that he'd done what he was accused of. He just didn't think anybody would hold him accountable."

Voters will have to take on that responsibility, she said.

"I say, vote for the person who you believe can actually win in November, and the person who you think can govern our country," she advised. "Because somebody has to get in there and try to bring our country together and put us on the right track into the future and restore our democracy and our standing in the world."

"Who do you think can win?" she added. "Because if you don't win, you can't govern. And who can best govern at a very difficult time in American history."

Asked directly about her preference for the Democratic nominee, Clinton declined to name a candidate. In a new documentary about her, "Hillary," which will premier in March on Hulu, she slammed Sanders for his work on Capitol Hill.

She did not back down Thursday.

"I feel like I have a pretty clear perspective on what it'll take to win," she said, adding "as I said in the film, you've got to be responsible about what you say you're going to do."

"And if you promise the moon and you can't deliver the moon, then that's going to be one more indicator of how we just can't trust each other."

"I just want everybody to understand how high the stakes are and to hold every candidate and every public office holder accountable for what they do or don't do," she added.

She also talked about revisiting the gut-wrenching exposure after her husband, President Bill Clinton, and his affair with Monica Lewinsky, and having to relive it for the making of the documentary.

"Staying in my marriage was the gutsiest decision I ever made," she said, adding, "you couldn't do a film about my life and not talk about it."

"It was an emotionally draining thing to go through again," she added. "It really does help other people.

"People need to be thoughtful about the decisions in their own lives," she continued, adding, "and we should be kinder."

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