Rep. Adam Schiff, the top Democrat on the House Intelligence Committee, is set to visit the White House grounds on Friday to review the same materials that his Republican counterpart, Chairman Devin Nunes, accessed earlier this month, press secretary Sean Spicer said Friday.

"He has made contact and is trying to arrange a time," Spicer said of Schiff's planned visit to the White House.

"I don't know the nature of — I know that the request was made, and that's one where there's follow-up at the staff level" to determine the logistics of Schiff's arrival, Spicer said.

Nunes has been criticized over the past two weeks for reviewing materials on the White House grounds related to surveillance of President Trump's associates, then returning to the White House to brief Trump personally on his findings before sharing those revelations with members of his own committee.

Schiff has questioned Nunes' credibility, and has since demanded access to the same documents. Nunes has stressed that the reports he reviewed, which contained the "unmasked" identities of Trump aides whose communications had been swept up in the surveillance of foreigners, are totally unrelated to Russia.

The White House has been unable to answer questions about who escorted Nunes onto White House grounds and who provided him access to the secure facility where the House Intelligence Committee chairman read the reports. Spicer declined to answer those questions again on Friday.

"We don't track every single person on the 18 acres," Spicer said.

In his own statement, Schiff indicated skepticism that he'd be able to learn as much as Nunes learned. He said he is "fully cognizant of the fact that in the absence of the appropriate agency representatives it will not be possible to understand the full content and context of any documents we may review."

Schiff said he would be "urging the administration to make all these documents available to the full House and Senate Intelligence Committees."

He also said he wants all documents released to Congress and relevant agencies, and said the White House needs to "fully disclose" what role it played in concealing that "the White House was the very source of documents presented to the White House."