The Office of Legal Counsel (OLC) is an office in the United States Department of Justice that assists the Attorney General's position as legal adviser to the President and all executive branch agencies.
The Office of Legal Counsel was created in 1934 by an act of US Congress, as part of a larger reorganization of executive branch administrative agencies. It was first headed by an assistant solicitor general. In 1951, Attorney General J. Howard McGrath made it a division led by an assistant attorney, and named it the Executive Adjudications Division. This name was changed to Office of Legal Counsel in an administrative order by Attorney General Herbert Brownell Jr., issued April 3, 1953.
The Office of Legal Counsel (OLC) assists the Attorney General of the United States in their function as legal adviser to the President and all the executive branch agencies, hence the appellation "the president's law firm.". The OLC drafts legal opinions of the Attorney General and also provides its own written opinions and oral advice in response to requests from the Counsel to the President, the various agencies of the executive branch, and offices within the Department of Justice. Such requests typically deal with legal issues of particular complexity and importance or about which two or more agencies are in disagreement. The Office also is responsible for providing legal advice to the executive branch on all constitutional questions and reviewing pending legislation for constitutionality. The decisions of the Office are binding on all executive agencies.
All executive orders and proclamations proposed to be issued by the President are reviewed by the OLC for form and legality, as are various other matters that require the President's formal approval.
In addition to serving as, in effect, outside counsel for the other agencies of the executive branch, the OLC also functions as general counsel for the Department of Justice itself. It reviews all proposed orders of the Attorney General and all regulations requiring the Attorney General's approval.