The Senate Select Committee on Intelligence has reportedly asked more than a dozen organizations, agencies and individuals to preserve all materials related to the probe into Russian interference in the election, including any Trump administration contact with Russian officials.

The bipartisan leaders of the committee sent out formal letters late last week asking the White House, Justice Department and FBI to confirm that they are preserving all documentation that shows any contact between Trump administration, campaign or transition team officials and the Russian government, according to an Associated Press report.