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 Tuesday that "everything points to" collusion between President Trump's campaign and the Russians during the 2016 presidential election, The Associated Press reported Tuesday.

"My feeling is that there was some cooperation between the Trump campaign and the Russians. I think everything points to that," Franken told former late-night host David Letterman during a discussion about Franken's new book.

Franken, pointing to the appointment of former FBI Director Robert Mueller as special counsel to lead the investigation into Russian election meddling, did not provide evidence to support his accusation, the AP reported.

"They just haven't been acting like people who have nothing to hide,” Franken added.

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Franken, who rose to prominence as a writer and comedian on "Saturday Night Live,” made a joint appearance with Letterman to discuss his new memoir about his time in the Senate.

The Democratic senator has repeatedly denied he has plans to run for president in 2020, saying instead that he plans to run for a third term in the upper chamber.

"I see myself running for reelection in 2020," he told Letterman.

Franken’s comments come as federal and congressional investigators look into whether Trump campaign aides colluded with the Russians in order to sway the election.

Trump has repeatedly denied the allegations.

Franken and Letterman didn't discuss the recent backlash over comedian Kathy Griffin posing for a photo with a prop meant to look like Trump’s bloody, severed head.

Michael Dale-Stein, a spokesman for Franken, denounced Griffin’s photo and called it “inappropriate.” But in a CNN interview Wednesday, Franken said he still plans to appear with Griffin at an event promoting his book.