Sen. Al FrankenAlan (Al) Stuart FrankenFormer campaign aide to New Jersey governor says she was sexually assaulted by his ex-staffer Prosecutor drops some charges against Harvey Weinstein Poll: Dems maintain double-digit leads in Minnesota Senate races MORE (D-Minn.) said Sunday that Donald TrumpDonald John TrumpTrump: 'I don't trust everybody in the White House' JPMorgan CEO withdraws from Saudi conference Trump defends family separations at border 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.