The Congressional Research Service is the preeminent independent US government research agency that all Members of Congress rely upon for expert research by experts on any subject.
For a Congressional Research Service researcher to research a topic, a Member of Congress must make a request. There is no other way.
With this letter you will ask your Congressional Delegation to contact the Congressional Research Service and ask a simple question, “Has the US government investigated the June 8, 1967 Israeli attack on the USS Liberty?”