Not sure why people are making such a big deal out of Trump and RR statements today. It was already implicitly part of the IG scope as outlined in March -

The OIG will initiate a review that will examine the Justice Department’s and the Federal Bureau of Investigation’s compliance with legal requirements, and with applicable DOJ and FBI policies and procedures, in applications filed with the U.S. Foreign Intelligence Surveillance Court (FISC) relating to a certain U.S. person,” the statement obtained by Fox News read. “As part of this examination, the OIG also will review information that was known to the DOJ and the FBI at the time the applications were filed from or about an alleged FBI confidential source.”

The OIG statement added that Horowitz also would “review the DOJ’s and FBI’s relationship and communications with the alleged source as they relate to the FISC applications.”

The statement continued, “If circumstances warrant, the OIG will consider including other issues that may arise during the course of the review.”

http://www.foxnews.com/politics/2018/03/28/doj-inspector-general-investigates-alleged-fisa-abuses-by-doj-fbi.html