There should be a congressional investigation run by the senate intelligence committee.

A congressional investigation found no positive evidence of impropriety.

The emails were under subpoena as part of the congressional investigation.

A congressional investigation followed, and legislation was passed that required products fortified with cottonseed oil to be labeled as lard compound.

A congressional investigation several years later revealed that across the government, just fewer than 150 employees were engaged in public relations along with an additional 14 part-time workers.