They work for us, are paid by us, and are responsible to us. When our Representatives (us) want to talk with any of them, with the exclusion of executive privilege,  either they show up, subpoena them, and if they fail to cooperate, fire them. This is a perfect example of Washington's corruption. It's no longer of and by the people, and it's hardly for the people. It has become so incestuous citizens have become nothing but spectators. As a néutral I sit back watch what is happening and then don't understand why segments of our society äre baffled by the Trump election. The frustration of the people is replete. Everyone at the FBI works for Trump  as executive. Grassley and Feinstein should go directly to Trump and have him order them to appear. Recognizing Trump as President, Chief Executive and Commander and Chief is not voluntary. Mueller works for us too.