Senate Armed Services Committee
The Senate Intelligence Committee has sent formal requests to more than a dozen organizations, agencies and individuals, including the White House, asking them to preserve all materials related to the committee's probe into Russia-related dealings, according to a congressional aide, Feb. 18, 2017. In this photo, Air Force Chief of Staff Gen. Mark A. Welsh III (R) testifies about pending legislation regarding sexual assaults in the military at a Senate Armed Services Committee on Capitol Hill in Washington on June 4, 2013. Reuters

The Senate Intelligence Committee's chairman Richard Burr (R-N.C.), and Vice Chairman Mark Warner (D-Va.) sent out letters Friday, sending formal requests to the White House and over a dozen organizations, individuals and agencies that all materials concerning the probe into the Russian dealings with the U.S. be preserved, the Associated Press reported Sunday citing a congressional aide.

The committee members also received a classified briefing from FBI Director James Comey on Friday. However, the members did not comment on what was discussed at and after the hour-long briefing.

"I think they're going to do their job. And they have to do that. Those are things that Richard Burr and that team have to do," White House chief of staff Reince Priebus said Sunday.

"That doesn't mean that there's anything there. It just means they need to do some things that satisfy their committee, that they've looked into something. And then they can have meetings behind closed doors that they always do in the Intel Committee, and then they'll issue a report," Priebus told NBC's "Meet the Press."

Priebus also denied that members of President Donald Trump's campaign had contact with Russia before Trump's victory.

"We don't know of any contacts with Russian agents," Priebus said.

The letters that were sent out Friday by the Senate Intelligence Committee asked for confirmation that the White House, the FBI and the Justice Department had directed their employees to maintain all materials and evidences related to any contacts that Trump's administration, transition team, campaign or any other person acting on their behalf have had with Russia or its government officials.

Congressional staffers argued that they had not discovered any evidence to show that materials related to the probe are not being preserved.

However, Senate Democratic leader Chuck Schumer of New York said Thursday on the Senate floor: "There is real concern that some in the administration may try to cover up its ties to Russia by deleting emails, texts and other records that could shine a light on those connections. These records are likely to be the subject of executive branch as well as congressional investigations and must be preserved."