During an interview with NBC News on Wednesday, House intelligence committee Chairman Devin Nunes insisted that House Democrats “aren’t serious” when it comes to investigating Russia’s role in the 2016 presidential election.

Nunes was also asked if he was surprised when Rep. Walter Jones of North Carolina was the first GOP member to urge him to recuse himself from the case.

Nunes said he wasn’t and added: “We’re beginning to figure out who’s actually serious about the investigation. Because it appears like the Democrats aren’t really serious about the investigation.”

Even though Nunes is the one who cancelled all the scheduled meetings, bringing the investigation to a standstill, he claims that it’s the Democrats who are obstructing the investigation.

“They need to give us their witness list because we have no idea who they even want to interview,” Nunes insisted. “As far as I know they’ve done very little to even look through the documents that the intelligence agencies have provided. So, at the end of the day here, we’re going to get to the truth, we’re going to find out who’s actually doing a real investigation.”

Nunes threatened to continue the investigation without them if he had to.

“At the end of the day, we’re going to do an investigation with or without them,” he said. “And if they want to participate, that’s fine.”

According to Democrats, the chairman canceled the hearings in an effort to stop former acting attorney general Sally Yates from testifying.