California Rep. Eric Swalwell, a Democrat on the House Intelligence Committee, knocked the committee's chairman Devin Nunes Thursday, saying that his surprise decision to brief President Trump Donald John TrumpHR McMaster says president's policy to withdraw troops from Afghanistan is 'unwise' Cast of 'Parks and Rec' reunite for virtual town hall to address Wisconsin voters Biden says Trump should step down over coronavirus response MORE on alleged incidental surveillance damaged the "good name" of the committee.

Nunes on Wednesday said that he had seen reports that suggest that agencies had collected intel on members of Trump's transition team through routine surveillance of foreign targets.

Since making the statement, Nunes has yet to share the evidence with fellow committee members or reveal his sources.

Nunes has also come under fire, despite apologizing, for his decision to go to the White House and brief the president on what he had seen without discussing it with the committee beforehand.

In an MSNBC interview, Swalwell hit Nunes, saying he was given "too much credit" for his apology and demanded to see the evidence.

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"Actions speak louder than words and as I sit here tonight we have still not seen the evidence that he took over to the White House before even telling us that there was evidence about Donald Trump's wiretapping claims," Swalwell said.

"Of course, no evidence has validated what Donald Trump has said, but Intelligence Committee members, including his own Republican members, have not seen this evidence and we are demanding to see it by tomorrow, otherwise we are going to have to reevaluate where this investigation goes," Swalwell continued.

Swalwell said he and other committee members are frustrated over Nunes's decision because it affected the image of the committee's work.

"The reason we're so upset is that we take a lot of pride in the independence and collaboration the Intelligence Committee is supposed to show," Salwell said. "To pull such a stunt and help the president, he has sacrificed the good name of this committee."