Some members of Congress suggested that the Unknown Soldier could be buried in the tomb at the U.S. Capitol that was originally meant for President George Washington. Congress ultimately agreed, however, that the remains should lie in state in the Capitol Rotunda before being laid to rest in a tomb at Arlington National Cemetery.
Publications of the U.S. Government, National Archives and Records Administration
He should not be taken from any particular battlefield, but should be so chosen that nobody would know his identification or the battlefield he comes from. He should represent in himself the North, the South, the East, and the West.
Representative Hamilton Fish of New York, Return of Body of Unknown American Who Lost His Life during World War . . . , February 1, 1921