The C.I.A. headquarters in Langley, Va. The whistle-blower is a C.I.A. officer, people familiar with the matter said.

White House Knew of Whistle-Blower’s Allegations Soon After Trump’s Call With Ukraine Leader

The whistle-blower, a C.I.A. officer detailed to the White House at one point, first expressed his concerns anonymously to the agency’s top lawyer.

nytimes.com