Sen. Kamala Harris Kamala HarrisHarris faces pivotal moment with Supreme Court battle Nearly 40 Democratic senators call for climate change questions in debates Joe Biden has long forgotten North Carolina: Today's visit is too late MORE (D-Calif.) on Wednesday dismissed 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's list of potential Supreme Court nominees as "complete non-starters," insisting that the Senate should wait until after the November elections to confirm a new justice.

Harris' comments came shortly after Justice Anthony Kennedy announced that he would retire from the Supreme Court, setting the stage for Trump to nominate a second justice to the high court.

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"Given the stakes of this Supreme Court seat, which will determine the fate of fundamental constitutional rights, the American people, who will vote in less than 4 months, deserve to have their voice heard," Harris tweeted. "We shouldn't vote on confirmation until they have voted at the ballot box."

"The President’s list of potential SCOTUS nominees are complete non-starters," she added. "They are conservative ideologues, not mainstream jurists. We cannot and will not accept them to serve on the highest court in the land."

Given the stakes of this Supreme Court seat, which will determine the fate of fundamental constitutional rights, the American people, who will vote in less than 4 months, deserve to have their voice heard. We shouldn't vote on confirmation until they have voted at the ballot box. — Kamala Harris (@SenKamalaHarris) June 27, 2018

The President’s list of potential SCOTUS nominees are complete non-starters. They are conservative ideologues, not mainstream jurists. We cannot and will not accept them to serve on the highest court in the land. — Kamala Harris (@SenKamalaHarris) June 27, 2018

Harris' comments echoed those of other Democrats on Wednesday. Senate Minority Leader Charles Schumer Chuck SchumerCruz blocks amended resolution honoring Ginsburg over language about her dying wish Senate Democrats introduce legislation to probe politicization of pandemic response Schumer interrupted during live briefing by heckler: 'Stop lying to the people' MORE (D-N.Y.) said in a speech on the Senate floor on Wednesday that it would be hypocritical for Senate Majority Leader Mitch McConnell (R-Ky.) to hold a vote on a Supreme Court nominee before the midterm elections.

McConnell announced moments earlier that he planned to hold a vote on Trump's next nominee in the fall.

After the death of former Justice Antonin Scalia in 2016, McConnell refused to hold a vote on then-President Barack Obama Barack Hussein ObamaThe Memo: Trump's strengths complicate election picture Obama shares phone number to find out how Americans are planning to vote Democrats' troubling adventure in a 'Wonderland' without 'rule of law' MORE's nominee for the court, 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, saying that the Senate should wait until after the presidential election.

Trump was elected later that year, and eventually nominated Neil Gorsuch to the court. He was confirmed by the Senate last year.

It's not yet clear whom Trump will nominate to replace Kennedy on the court. The White House released a list of 25 potential nominees in November, and Trump said on Wednesday that he plans to make his selection from that very list.