By Eric Bradner and Manu Raju CNN

WASHINGTON (CNN) -- The Senate Intelligence Committee is asking more than a dozen agencies, organizations and individuals to preserve communications related to the panel's investigation into Russian interference in the 2016 election.

The panel, led by chairman Richard Burr, R-North Carolina, and top Democrat, Mark Warner of Virginia, sent letters asking for those materials to be kept, a Senate aide said Sunday.

The move comes amid inquiries into whether President Donald Trump's campaign officials were in contact with senior Russian intelligence officials during the 2016 race. High-level advisers close to then-presidential nominee Donald Trump were in constant communication during the campaign with Russians known to US intelligence, multiple current and former intelligence, law enforcement and administration officials have told CNN.

White House chief of staff Reince Priebus told NBC's "Meet the Press'' aired on Sunday that he is aware of the letter, adding that the request for records "doesn't mean that there's anything there."

"And as long as they do their job, and we cooperate with them, they'll issue a report, and the report will say there's nothing there," he said.

In an interview on Fox News, also on Sunday, Priebus denied any collusion between the campaign and Russian officials, saying unnamed "top-level" US intelligence officials told him the report was "complete garbage."

Senate Democratic Leader Chuck Schumer of New York said on the Senate floor Thursday that "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."

Committee members discussed Russia in a private meeting with FBI Director James Comey on Friday.

At a conference in Munich this weekend, Sen. Lindsey Graham, R-South Carolina, declared, "2017 is going to be the year of kicking Russia in the ass in Congress."

CNN's Pamela Brown, Jim Sciutto and Evan Perez contributed to this report.

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