The US Secret Service is investigating after cocaine was found at the White House on Sunday night.
The discovery in the West Wing, which contains the Oval Office and other working areas for presidential aides and staff, led to a brief evacuation.
Secret Service agents found the suspicious powder in an area that is accessible to tour groups while doing a routine inspection.
President Joe Biden and his family were at Camp David in Maryland at the time.
A senior law enforcement official told newsmen that the substance was found in a storage facility routinely used by White House staff and guests to store mobile phones.