Washington (CNN) Rep. Adam Schiff said Thursday he's concerned Republicans are working to end the Russia investigation.

"I think they view shutting us down as a prerequisite to shutting Bob Mueller down," Schiff said on CNN's "The Situation Room." "And we see some very disturbing signs that that's what they intend to do."

In the interview, Schiff noted several Republicans who were critical of special counsel Robert Mueller during a hearing on Wednesday with Deputy Attorney General Rod Rosenstein.

And when CNN's Wolf Blitzer asked the Democrat from California if he feared Republicans were attempting to pave the way to shut down the investigation, Schiff replied: "I do."

"We are scheduled to have witness interviews out of state at a time next week when we'll be voting to keep the government running, when we'll be voting ... potentially, on this tax bill for the wealthy, so we can't leave to do these interviews, and nonetheless even though these witnesses are very important and have been on our witness list for months and months and they haven't been willing to bring them in until now, they're pulling these kind of tactics, which say to me they're trying to bring this to an end," Schiff later added.

Read More