The search is part of an investigation into the possible sharing of classified documents, though Natanson herself is not the target of the probe.
Investigators are reportedly probing Aurelio Perez-Lugones, a Maryland-based system administrator with top security clearance, accused of taking classified intelligence reports.
Natanson has been covering the Trump administration's reshaping of government, including speaking with federal employees about their experiences.
The Washington Post described the search of its reporter's home as “highly unusual and aggressive.”