Democrats have accused Nunes of coordinating with the White House to distract attention from the investigation into potential ties between the Trump team and Russian officials, and they called for him to recuse himself from the Russia investigation or step down.
"We're not asking the House to play any role in our investigation. We don't plan to play any role in their investigation," Burr said.
While much of the House Intelligence Committee's political infighting has taken place in public, the Senate so far has conducted the entirety of its Russia investigation behind closed doors - except for a public hearing in January with FBI Director James Comey, National Security Agency Director Mike Rogers, then-Director of National Intelligence James Clapper and then-CIA Director John Brennan.
But the main difference between the House and Senate processes lies in how united the two Senate leaders are.
"Over the last month we've seen some progress," Warner said. Later, with a hand on Burr's shoulder, he added: "I have confidence in Richard Burr that we together, with the members of our committee, are going to get to the bottom of this."