https://www.congress.gov/

The Congress site allows you to track all legislation and view schedules for committee hearings, including confirmation hearings for treaties and appointments.

www.whitehouse.gov/

The official White House site contains the latest announcements from the current administration, and an extensive history of the Presidency and previous Presidents. 

www.gwu.edu/~nsarchiv/index.html

An independent, non-governmental research institute and library located at The George Washington University, the National Security Archive collects and publishes declassified documents obtained through the Freedom of Information Act.

http://www.c-spanvideo.org/program/302106-1

This site provides transcripts and video of a scholarly conference on the role of Congress within US foreign policy-making.