Dear Mr. Vincelli,
Thank you for posting your request on History Hub!
We do not have Immigration and Naturalization Service or US Navy generated passenger manifests for the USS George Washington.
We searched the National Archives Catalog and located the Logbooks of U.S. Navy Ships, 1801 - 1940 in the Records of the Bureau of Naval Personnel (Record Group 24) that include the deck logs of the USS George Washington for 9/6/1917 through 11/28/1919. The deck logs for the presidential voyages may include a list of the members of his party. For more information, please contact the National Archives at Washington, DC - Textual Reference (RDT1) via email at firstname.lastname@example.org.
Due to the COVID-19 pandemic and pursuant to guidance received from the Office of Management and Budget (OMB), NARA has adjusted its normal operations to balance the need of completing its mission-critical work while also adhering to the recommended social distancing for the safety of NARA staff. As a result of this re-prioritization of activities, you may experience a delay in receiving an initial acknowledgement as well as a substantive response to your reference request from RDT1. We apologize for this inconvenience and appreciate your understanding and patience.
We hope this is helpful. Best of luck with your research!