Sen. Cory Booker Cory Anthony BookerBipartisan praise pours in after Ginsburg's death DHS opens probe into allegations at Georgia ICE facility Democratic lawmakers call for an investigation into allegations of medical neglect at Georgia ICE facility MORE (D-N.J.) said Tuesday that senators who don’t oppose 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 Supreme Court nominee Brett Kavanaugh are “complicit in the evil.”

Booker, speaking at a press conference with Sen. Elizabeth Warren Elizabeth WarrenDimon: Wealth tax 'almost impossible to do' CNN's Don Lemon: 'Blow up the entire system' remark taken out of context Democrats shoot down talk of expanding Supreme Court MORE (D-Mass.) and religious and moral leaders, said that Kavanaugh’s nomination “has nothing to do with politics” but with “who we are as moral beings.”

“I’m here to call on folks to understand that in a moral moment, there is no neutral. In a moral moment, there is no bystanders,” he said. “You are either complicit in the evil, you are either contributing to the wrong, or you are fighting against it.”

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Booker called on senators to reject Kavanaugh, saying that his “ancestors said if someone shows you who they are, believe them the first time.”

“He has shown us who he is,” he added.

Warren similarly urged senators to reject Kavanaugh’s nomination.

“It is not enough to have a good heart … we are called to act,” Warren said. ”We are on the moral side of history.”

Both Democratic senators had previously promised to oppose Kavanaugh when Trump tapped him for the Supreme Court vacancy created by Justice Anthony Kennedy's retirement.

Sen. Rand Paul Randal (Rand) Howard PaulRand Paul says he can't judge 'guilt or innocence' in Breonna Taylor case Overnight Health Care: Health officials tell public to trust in science | Despair at CDC under Trump influence | A new vaccine phase 3 trial starts Health officials tell public to trust in science MORE (R-Ky.) said in an interview published Monday that he is "undecided" on whether he will support the Supreme Court pick, citing Kavanaugh's past rulings on Fourth Amendment rights.

Senate Republicans are planning to hold the vote on Kavanaugh's nomination ahead of the 2018 midterms: The GOP currently holds the Senate 51-49, leaving whether or not the nomination passes up to Republicans and red-state Democrats.