Yes, of course.
https://www.justice.gov/olc
ABOUT THE OFFICE
By delegation from the Attorney General, the Assistant Attorney General in charge of the Office of Legal Counsel provides legal advice to the President and all executive branch agencies. The Office drafts legal opinions of the Attorney General and provides its own written opinions and other advice in response to requests from the Counsel to the President, the various agencies of the Executive Branch, and other components of the Department of Justice. Such requests typically deal with legal issues of particular complexity and importance or those about which two or more agencies are in disagreement. The Office is also responsible for reviewing and commenting on the constitutionality of pending legislation.