TAPPER: Welcome back to THE LEAD. Sticking with our politics lead today, a rare joint press conference today by Republican chairman and Democratic vice chairman of the Senate Intelligence Committee, offering all of us a glimpse into the status of their investigation into Russian interference in the 2016 presidential election. The duo today said that the issue of possible collusion by Trump associates and the Kremlin is still an open question. CNN justice correspondent Pamela Brown joins me now. And, Pamela, Senators Burr and Warner said they have interviewed more than 100 witnesses and thus far, they cannot rule out collusion.</s>PAMELA BROWN, CNN JUSTICE CORRESPONDENT: Yes, that's right, Jake. Nearly ten months into their investigation, both the Republican and Democratic leaders of the Senate Intelligence Committee say they are still looking into possible collusion, and an investigation that the senators say has expanded in scope. And while they made clear they still have work to do, they also said Trump campaign officials have been cooperative.</s>SEN. RICHARD BURR (R-NC), CHAIRMAN, INTELLIGENCE COMMITTEE: The committee continues to look into all evidence to see if there was any hint of collusion.</s>REPORTER: But do you have any evidence to suggest, to rule out that the president knew anything about any of these contacts that occurred between associates and the Russians?</s>BURR: I thought I was pretty clear, that the issue of collusion is still open, that we continue to investigate both intelligence and witnesses. And that we are not in a position where we will come to any type of temporary finding on that until we've completed the process.</s>BROWN (voice-over): Today, while the Republican and Democratic leaders of the Senate Intelligence Committee say they continue to investigate possible collusion between Russia and the Trump campaign, one part of their investigation has hit a snag.
Senate Intelligence Chief: We're Still Looking at Possible Collusion.