The American Civil Liberties Union is spending $1 million on an advertisement campaign to discourage the confirmation of Supreme Court nominee Brett Kavanaugh.

The campaign mostly targets Republican Sens. Deb Fischer of Nebraska, Cory Gardner of Colorado, Shelley Moore Capito of West Virginia, and Lisa Murkowski of Alaska, as well as Sen. Joe Manchin, D-W.Va.

“America is watching,” the ad voice over said. “And as we choose a lifetime seat on our highest court, integrity matters. And we cannot have any doubt.”

The ACLU’s campaign will not be targeting moderate Republican Sens. Susan Collins of Maine and Jeff Flake of Arizona, who are undecided on whether or not they will vote Kavanaugh once it reaches the Senate floor.

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Murkowski, Manchin, Collins, and Flake all called for an FBI investigation into the sexual assault allegations against Kavanaugh before the Senate votes, and that investigation is ongoing this week.

Over the weekend, the ACLU opposed Kavanaugh’s confirmation to the Supreme Court, breaking with its usual silence on judicial nominees.

“The ACLU’s board of directors, deeply concerned by the allegations raised in recent weeks, has made a rare exception to its longstanding policy and voted to oppose the nomination of Brett Kavanaugh to the Supreme Court,” ACLU President Susan Herman said in a Saturday statement.

Several women have come forward to accuse Kavanaugh of engaging in sexual assault or misconduct while he was a teenager. Kavanaugh has denied the allegations.

Kavanaugh and his first accuser, Christine Blasey Ford, testified before the Senate Judiciary Committee Friday. The committee voted along party lines to recommend Kavanaugh to the position as the vote moves to Senate.

The vote is currently stalled after President Trump approved a limited in scope, one-week FBI investigation into the allegations.