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.) said Sunday that Donald Trump Donald John TrumpOmar fires back at Trump over rally remarks: 'This is my country' Pelosi: Trump hurrying to fill SCOTUS seat so he can repeal ObamaCare Trump mocks Biden appearance, mask use ahead of first debate 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.