Sen. Mazie Hirono Mazie Keiko HironoManchin defends Supreme Court candidate Barrett: 'It's awful to bring in religion' Democrats shoot down talk of expanding Supreme Court Democrats unveil plan declaring racism a public health issue MORE (D-Hawaii) said the Democrats could keep retired Supreme Court Justice Anthony Kennedy's seat vacant for two years if need be should the nomination of Brett Kavanaugh to replace him fail and should Democrats take the Senate in November.

Hirono said if a replacement for Kavanaugh needed to be found, President Trump Donald John TrumpBiden on Trump's refusal to commit to peaceful transfer of power: 'What country are we in?' Romney: 'Unthinkable and unacceptable' to not commit to peaceful transition of power Two Louisville police officers shot amid Breonna Taylor grand jury protests MORE should nominate a less conservative ideologue, or else be ready for Senate Democrats to keep the court seat vacant until after the 2020 presidential election if they win the chamber in November, according to an interview with Politico Magazine.

“I think we’ve had those kinds of vacancies before, and we certainly had over a one-year vacancy with Merrick Garland Merrick Brian GarlandPoll: 59 percent think president elected in November should name next Supreme Court justice Mark Kelly: Arizona Senate race winner should be sworn in 'promptly' Chief justice honors Ginsburg: 'When she spoke, people listened' MORE,” Hirono told Politico. “So the world does not come to an end because we don’t fill all of the nominees.”

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Kavanaugh's nomination to the Supreme Court was roiled when California professor Christine Blasey Ford on Sunday publicly accused him of sexually assaulting her when the two were students at neighboring D.C.-area high schools in the 1980s. Kavanaugh has strongly denied the allegations.

The Hawaii senator said the new allegation had cast doubts about the nominee's testimony to the Senate two weeks ago.

During the hearing, Hirono asked Kavanaugh if he had ever sexually assaulted or harassed someone as a "legal adult." He responded that he had not.

“It somewhat stretches credulity, let’s put it that way,” Hirono told Politico. “I think he didn’t want to lie about it, so one way you get through that is saying, ‘I don’t remember.’ ”

Hirono also called the allegations against Kavanaugh serious, even if he was 17 years old at the time of the alleged incident.

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“Seventeen is not exactly a baby, either," Hirono said. "These are serious allegations. She has a very credible story. I believe her. And now we have to do more than say, ‘Well, look at the timing!’ and ‘Well, it’s all politically motivated!’ "

"This has to be taken seriously," she said.

Kavanaugh and his accuser are set to testify publicly on Monday.