The Secret Service will examine consulting cameras and entrance logs to determine who had access to the space, the report said on Tuesday.
A suspicious substance was discovered at the White House on Sunday evening, sparking a brief evacuation. The white powder tested positive for cocaine in a preliminary test, media reported.
US President Joe Biden's son Hunter, involved in several drugs and corruption scandals, was in the White House grounds not long before the white powdery substance was found in the West Wing, the daily news outlet reported.