Sen. Claire McCaskill Claire Conner McCaskillMomentum growing among Republicans for Supreme Court vote before Election Day Democratic-linked group runs ads in Kansas GOP Senate primary Trump mocked for low attendance at rally MORE (D-Mo.) on Thursday joined calls for an ethics investigation into the accusations that Sen. Al Franken Alan (Al) Stuart FrankenGOP Senate candidate says Trump, Republicans will surprise in Minnesota Peterson faces fight of his career in deep-red Minnesota district Getting tight — the psychology of cancel culture MORE (D-Minn.) groped and kissed a woman without her consent, calling such behavior “completely unacceptable.”

“I’m shocked and concerned. The behavior described is completely unacceptable. Comedy is no excuse for inappropriate conduct, and I believe there should be an ethics investigation,” McCaskill tweeted.

Re Al Franken: I’m shocked and concerned. The behavior described is completely unacceptable. Comedy is no excuse for inappropriate conduct, and I believe there should be an ethics investigation. — Claire McCaskill (@clairecmc) November 16, 2017

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Radio anchor and sports broadcaster Leeann Tweeden on Thursday accused Franken of kissing her and groping her without her consent in 2006. The incident happened when the two were part of a USO tour to “entertain our troops,” Tweeden wrote.

Franken, who headlined the trip as a comedian, wrote a skit in which he kissed Tweeden, she charged. He insisted they rehearse the scene, she said, at which point he kissed her despite her objections.

Tweeden also published a photo of Franken appearing to grab her chest while she was sleeping on a flight back to the U.S.

Senate Majority Leader Mitch McConnell Addison (Mitch) Mitchell McConnellMomentum growing among Republicans for Supreme Court vote before Election Day Trump expects to nominate woman to replace Ginsburg next week Video of Lindsey Graham arguing against nominating a Supreme Court justice in an election year goes viral MORE (R-Ky.) called for the Senate Ethics Committee to review the allegations.

Franken released a statement shortly after Tweeden’s article was published, saying he would "gladly cooperate" in an ethics investigation.

“I certainly don’t remember the rehearsal for the skit in the same way, but I send my sincerest apologies to Leeann. As to the photo, it was clearly intended to be funny but wasn’t. I shouldn’t have done it," he said in a separate statement.

Another fellow senator, Kirsten Gillibrand Kirsten GillibrandSunday shows preview: Justice Ginsburg dies, sparking partisan battle over vacancy before election Suburban moms are going to decide the 2020 election Jon Stewart urges Congress to help veterans exposed to burn pits MORE (D-N.Y.), said she believes Franken's accuser and said she expects to hear more from Franken.