Democratic Sen. Jeff Merkley said the House Intelligence Committee's investigation into Russian election meddling has been left "in shreds" by the actions of its chairman Rep. Devin Nunes.
Merkley on CNN's 'New Day' program also called for a multiple-pronged investigation into Russia.
"I think there has been so much tactics and strategy by the House chairman to support the president that the credibility of the House really is in shreds," Merkley said.
He noted he's "pretty much" given up on the House committee's probe.
"I think anywhere the House gets to, the Senate will have gotten to previously."
But he stressed he has faith in the Senate Intelligence Committee probe into Russia's actions and said there is room for multiple investigations into the issue.
"This is such serious information that it should be pursued by the FBI," he said. "It should be pursued by the intel committee. It should be pursued by a special prosecutor and there should be a public commission.
"By having multiple directions, we might actually get to the bottom of it."
Last week Nunes said he had seen evidence that showed the U.S. intelligence community incidentally surveilled Donald Trump's transition team before his inauguration and then briefed the president about it without first taking it to his own committee.
Then earlier this week, Nunes admitted that he met with a source on White House grounds to view evidence of the surveillance.
House Speaker Paul Ryan has backed Nunes and opposed Democrats' calls for the chairman to recuse himself.
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