Sen. Mark Warner (D-VA), the top Democrat on the Senate Intelligence Committee, rejected Republican Chairman Richard Burr’s (R-NC) recent statements that the committee has not found evidence of collusion, saying the investigation is still ongoing and the committee still had to interview key witnesses, CNN reports.

Said Warner: “Respectfully, I disagree. I’m not going to get into any conclusions I’ve reached because my basis of this has been that I’m not going to reach any conclusion until we finish the investigation. And we still have a number of the key witnesses to come back.”

“Warner’s comments represented a rare public split for the leaders of the Senate Intelligence Committee, which has been the only congressional panel that has kept its investigation into Russia’s 2016 election meddling on a bipartisan track.”