Sen. Angus King, I-Maine, said Sunday the first indictments under special counsel Robert Mueller's Russia probe, expected to be made public Monday, are "really just the beginning."

"Like everyone else in Washington, I'll be watching tomorrow to see what comes out of the Mueller investigation, but I think it's important to emphasize that this, whatever it is, is really just the beginning," King told CNN, referring to the first charges. "And I'm sure there will be additional evidence, assuming Director Mueller uncovers additional evidence."

But King admitted he was not aware of any specifics.

"I don't know any more than you or your prior guests about what those indictments are going to look like, who they're going to be, how many they're going to be," King told CNN host Jake Tapper. "I think we're just going to have to wait and see."

King expressed concern that the extent to which Russia meddled in the U.S. 2016 elections was being lost in the politics of the Trump-Kremlin collusion investigation by Mueller, as well as those being conducted on Capitol Hill.

"They have discovered a way to turn the strengths of our country and the West against ourselves," he said. "I call it geopolitical jiu-jitsu, where they're taking advantage of our free press and our open society and driving divisions, and there's no question that they did that in 2016 in a big way."

However, King disputed Trump's dismissal of collusion allegations, saying it was "certainly not commonly agreed in" the Senate Intelligence Committee there had been no collusion between the campaign and Moscow, and "we're the ones doing the investigation."