MSNBC host Rachel Maddow said in a newly published interview the collusion story between President Donald Trump and Russia might be fake news.

"I absolutely believe it's possible," Maddow told Rolling Stone. "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.

"But circumstantial evidence is circumstantial evidence. This is a serious thing that needs to be chased down to the end."

Maddow is regularly critical of Trump and his administration during her nightly show, including in March when she revealed pages of Trump's tax returns. Those revelations turned out to be somewhat of a dud, and she herself was criticized for it.

During the Rolling Stone interview, Maddow admitted that she "had the same shock as everybody," the morning after Trump won the presidential election. "But we had to get back on the air. And that's a very constructive place to be, because my job is to explain what's going on, what's important and whether there are factual and historically analogous things that might help you connect and understand the import of what's happening."