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House Intelligence Committee Chairman Devin Nunes apologized to committee members after going to the White House Wednesday with information about President Donald Trump's wiretapping accusations before sharing it with the committee, a Democrat on the panel said Thursday.

"He just apologized, he didn't specify what his apology was about," Rep. Jackie Speier, D-California, told reporters after a closed-door meeting.

Nunes' surprise solo trip to the White House without informing other committee members beforehand set off a firestorm among the Democratic members of the committee. Rep. Adam Schiff of California, the highest-ranking Democrat on the committee, said Nunes, R-California, needs to decide if he wants to be an independent investigator or "act as a surrogate of the White House."

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"Over the next few days we're going to assess whether or not we feel confident that he can continue in that role," Speier said.

The Republican leader of the powerful committee investigating Trump's claims that President Barack Obama "wiretapped" Trump Tower came under intense criticism from his Democrats for going to the president and the media before the committee.

Related: McCain: ‘Bizarre’ Behavior by House Intel Committee Leaders

Nunes told reporters Thursday that a source showed him intelligence reports indicating communication from members of Trump's presidential transition team, and even the president himself, were "incidentally collected" by intelligence agencies. He did not address speculation that his source could be someone inside the White House, saying that the committee's methods must be kept "very, very quiet."

"The president didn't invite me over, I called down there and invited myself because I thought he needed to understand what I saw and that he needed to try to get that information because he has every right to see it," Nunes said.

"It was a judgment call on my part," Nunes said. "At the end of day, sometimes you make the right decision, sometimes you make the wrong one — but you got to stick by the decisions you make.”

Related: What Does It Mean That Trump May Have Been ‘Incidentally’ Surveilled?

A spokesman for House Speaker Paul Ryan, R-Wisconsin, said he has "full confidence" that Nunes is conducting a fair investigation.

One Republican member of the Senate Judiciary Committee, Sen. James Lankford of Oklahoma, attempted to distance himself from Nunes' actions.

"I think it’s most appropriate for the Committees to work independent of the White House not next to the White House," he told reporters.