MSNBC host Rachel Maddow Rachel Anne MaddowGOP lawmakers distance themselves from Trump comments on transfer of power Schiff urges Trump administration members to resign: 'You cannot maintain your silence' Michael Cohen: Trump hates Obama because he's everything he 'wants to be' MORE acknowledged that President Trump Donald John TrumpFederal prosecutor speaks out, says Barr 'has brought shame' on Justice Dept. Former Pence aide: White House staffers discussed Trump refusing to leave office Progressive group buys domain name of Trump's No. 1 Supreme Court pick MORE's campaign may have had no knowledge of Russia's efforts to meddle in the 2016 election.

Asked in a Rolling Stone interview if she thought it is possible that the Trump campaign was clueless about Russian hacking during the campaign, Maddow said it was "absolutely" possible.

"I mean, Russia clearly did this attack, and there's lots of circumstantial evidence that points at lots of unexplained and surreptitious contact between Trump people and Russian people at the time that was happening," she said. "But circumstantial evidence is circumstantial evidence. This is a serious thing that needs to be chased down to the end."

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Maddow has covered the controversies surrounding federal investigations into possible collusion between the Trump campaign and Russia more than any other cable news host and has dedicated 53 percent of her show's coverage to Russia-related topics, according to an April analysis by The Intercept.

But Maddow told Rolling Stone that she was "not keeping it alive for its own sake," saying that the potential severity of the case presented the potential for a real "national crisis."

"If this presidency is knowingly the product of a foreign intelligence operation, that's not [Health and Human Services Secretary] Tom Price trading stocks that he was also affecting the price of as a public official, you know?" she said. "That is a full-stop national crisis."