He questioned why the materials came to the White House by way of Nunes rather than by a more direct route.
The White House's invitation letter came amid a quickly rising storm over Rep. Devin Nunes, who heads the House intelligence committee.
"I can not get into who those individuals were", Spicer said at the daily news briefing.
The NYT has published the names of two White House staffers who assisted House Intel Chair Rep. Devin Nunes (R-CA) when he went to the White House to view classified documents suggesting that Donald Trump and his aides were captured in incidental surveillance.
A Nunes spokesman, Jack Langer, also told the Los Angeles Times that it wasn't a White House staffer, the Times reported. The officials said that this month, shortly after Mr. Trump wrote on Twitter about being wiretapped on the orders of President Barack Obama, Mr. Cohen-Watnick began reviewing highly classified reports detailing the intercepted communications of foreign officials.
Speaking on Capitol Hill Thursday, Schiff said he was "more than willing" to accept the White House offer to view new information.
Spicer's comments come as the leaders of the House intelligence committee are trying to get their Russian Federation investigation back on the rails, according to Schiff. Nunes' committee is heading an investigation into Russia's involvement in the presidential election, and the chairman did not brief his fellow members on the intelligence reports before holding a press conference and meeting with the president on March 22. "We're in the process of exchanging witness lists and are going to see if by the end of the day we can agree on at least a common set of initial witnesses".
The committee leaders were trying to agree on a common set of initial witnesses, Schiff said, an issue that prompted the cancellation of both an open and closed hearing this week.
White House invites lawmakers to see intelligence material
The House panel's work has been deeply, and perhaps irreparably, undermined by Nunes' apparent coordination with the White House. The NYT has published the names of two White House staffers who assisted House Intel Chair Rep.
At the center of the dispute is a formal letter Nunes drafted last Friday, inviting Comey to brief the committee in private at the same time that former Acting Attorney General Sally Yates and others were supposed to testify before the committee in public.
He previously served on Trump's transition team.
That its objective was to block the public hearing and thereby reduce the combined pressure of the media and the Democratic Party on the White House was demonstrated by the fact that Nunes gave no date for the closed-door hearing for Comey and Rogers, which he now claimed was a higher priority.
The House panel's work has been deeply, and perhaps irreparably, undermined by Nunes' apparent coordination with the White House. The intelligence showed, he said, that Trump was "monitored".
But Schiff argued it was up to Nunes to restore credibility in the committee's investigation.
The Senate committee, which is conducting a parallel investigation, announced that it had drawn up a list of 15 to 20 people who would be asked to give sworn testimony about contacts between the Trump campaign and Russian government officials.
That includes Paul Manafort and Jared Kushner, Schiff added.