국정조사가 · 국정조사를
parliamentary investigation (into a specific issue)
Example
야당은 그 사건에 대한 국정조사를 요구했습니다.
The opposition demanded a parliamentary investigation into the incident.
Word parts
국 nation+정 government+조 investigate+사 examine
Literally 'investigating state affairs'.
Good to know
국정감사 is a regular yearly review; 국정조사 targets one specific scandal when needed.