Democratic Sen. Joe Manchin (W.Va.) admitted Sunday there is currently no evidence showing collusion between President Donald Trump's campaign and Russia.

CBS host John Dickerson asked Manchin on "Face the Nation" about the latest information he has received on the federal investigation into potential links between the Trump campaign and Russia and whether he has seen any evidence of collusion.

Manchin said he has seen no proof of collusion, despite accusations to the contrary from many who oppose Trump, including members of Congress who have threatened impeachment proceedings.

"There's an awful lot of smoke there, let's put it that way," Manchin said. "People that might have said they were involved, to what extent they were involved, to what extent the president might have known about these people or whatever, there is nothing there from that standpoint that we have seen directly linking our president to any of that."

Democrats have so far not been able to show hard evidence that Trump colluded with any Russian entities to help him win the 2016 presidential election.