The Department of Justice ( Department) Office of the Inspector General (OIG) undertook this review to examine certain actions by the Federal Bureau of Investigation (FBI) and the Department during an FBI investigation opened on July 31, 2016, known as "Crossfire Hurricane," into whether individuals associated with the Donald J. Trump for President Campaign were coordinating, wittingly or unwittingly, with the Russian government's efforts to interfere in the 2016 U .S. presidential election.
https://www.justice.gov/storage/120919-examination.pdf