… U.S. Constitution.
Constitution of the United States and the Declaration of Independence, House Document 112-129.
Constitution of the United States of America: Analysis and Interpretation via govinfo.
… Executive Orders and other presidential actions and papers.
… Presidential Libraries and White House Websites.
… Federal laws.
… Bills introduced in Congress.
Congress.gov. The numerous bill versions help to track a bill through the legislative process.
… Debate on the floor of the House or Senate.
Search or browse the Congressional Record via govinfo, which provides next-day coverage of the daily edition.
… Congressional websites.
… Court decisions.
… Briefs.
These materials can be difficult to find. Please contact me for assistance!
Major national newspapers provide good coverage of national politics: Washington Post, New York Times, and Wall Street Journal.
Other sources:
CQ Magazine
Published weekly. "In-depth reports on issues looming on the congressional horizon, plus a complete wrap up the previous week's news, including the status of bills in play, behind-the-scenes maneuvering, committee and floor activity, debates and all roll-call votes."
Keep your skills fresh! Check out Bowdoin's Evaluating Sources and Fake or Fact?: Fake News and Fact Checking.