Sen. Al FrankenAlan (Al) Stuart FrankenMaher chides Democrats: We 'suck the fun out of everything' Why Caitlyn Jenner should not be dismissed #MeWho? The hypocritical silence of Kamala Harris MORE (D-Minn.) said Sunday that Donald TrumpDonald TrumpWarren says Republican party 'eating itself and it is discovering that the meal is poisonous' More than 75 Asian, LGBTQ groups oppose anti-Asian crime bill McConnell says he's 'great admirer' of Liz Cheney but mum on her removal MORE's final ad, which includes multiple Jewish Americans, is "something of a German Shepherd whistle."

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"Well, when I saw the ad, I thought that this was something of a German Shepherd whistle, a dog whistle, to sort of the certain group of the United States," Franken told CNN's Jake Tapper on "State of the Union."

"I think that it does speak to a certain part of his alt-right base. [Steve] Bannon, I mean, who's head of Breitbart, is his chairman. They traffic in that," said Franken.

In a closing pitch to American voters, the Republican presidential nominee's campaign released a two-minute ad showing Federal Reserve Chairwoman Janet Yellen, Goldman Sachs CEO Lloyd Blankfein and George Soros. All three are Jewish.

"Trump has retweeted a lot of that sort of thing. And I think that it's an appeal to some of the worst elements in our country as a closing argument," Franken added.