Case senario:
The law firm's international law partner is an international law celebrity who was born in Europe and is now a U.S. citizen. He has been invited to speak at an international law conference and is going to give a speech on international war crimes. He has been very impressed with your work and wants your input regarding the United States' involvement with the International Criminal Court (ICC).
Specifically, he has asked that you research what the United States' official position is regarding the ICC, and then prepare him a summary of your findings. To complete your research, list and describe the sources of law that the ICC might utilize when trying a case.