Rep. Adam Schiff Adam Bennett SchiffDemocrats, advocates seethe over Florida voting rights ruling DHS asks Schiff to reconsider expanded probe after whistleblower complaint, declines additional interview requests Senate panel seeks documents in probe of DHS whistleblower complaint MORE (D-Calif.), the ranking Democrat on the House Intelligence Committee, said Sunday that it is too early to definitely conclude that members of President Trump’s campaign staff colluded with Russian associates to interfere in the U.S. election.

“I don’t think we can say anything definitively at this point,” Schiff told CNN’s “State of the Union.” “We are still at the very early stages of the investigation.”

Schiff, who has been leading the House committee’s probe into Russian meddling with Chairman Devin Nunes (R-Calif.), said it would be “irresponsible” not to get to the bottom of Russia’s interference in the presidential election.

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The House committee’s investigation into Russia has been hindered by political infighting after Nunes briefed President Trump on intelligence materials he reviewed that showed incidental surveillance of Trump transition team members. Nunes admitted that he visited White House grounds to meet with a source and analyze the material one day before briefing the president.

The New York Times reported last week that two White House officials helped Nunes obtain the relevant material. A spokesperson for Nunes following the report refused to “confirm or deny speculation about his source's identity.”

Schiff on Sunday reiterated his calls for Russia’s actions to be “thoroughly investigated” as part of the probe.