NARAL Pro-Choice America, another major organization on the left fighting against Kavanaugh's nomination, released two new online ads Monday targeting Heller and Maine Sen. Susan Collins, a key Republican swing vote who has been at the center of the left's efforts to block the judge's nomination to the Supreme Court.

Collins on Monday called for both Kavanaugh and Dr. Ford to testify before the Senate Judiciary Committee under oath.

Professor Ford and Judge Kavanaugh should both testify under oath before the Judiciary Committee.

— Sen. Susan Collins (@SenatorCollins) September 17, 2018

A vote in Judiciary Committee is slated for Thursday, but several GOP senators, including Arizona's Jeff Flake, have said that the committee should hear from Ford before they move forward on Kavanaugh's nomination.

In a press call Monday afternoon, leaders from several progressive organizations said the allegation against Kavanaugh should force his withdrawal.

\"This is a remarkable moment with echoes of the past, but also stark differences,\" said Nan Aaron, the founder and president of the Alliance for Justice, a liberal judicial advocacy group, \"I can tell you, every woman in America will be watching how this unfolds.\"

\"PHOTO:
Eduardo Munoz/Reuters, FILE
PHOTO: People take part in a protest against Supreme Court nominee Brett Kavanaugh, in front of the New York County Supreme Court at Foley Square in New York City, Aug. 26, 2018.
>

Ilyse Hogue, the president of NARAL, said that the Judiciary Committee that is overseeing Kavanaugh's nomination is not in a position to obtain a credible denial from the nominee in the face of Ford's allegation.

\"There is no way for the American people to be assured through any Senate Judiciary process that [Kavanaugh] can be trusted in his denials of this extraordinarily credible claim by a woman who had nothing to gain, and everything to lose by bravely coming forward and telling her story,\" Hogue told reporters, \"It is NARAL's position and the position of our members that Brett Kavanaugh should withdraw his nomination immediately.\"

ABC News' Rick Klein contributed to this report.

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