Will the U.S. Citizen sponsor be required to attend the U.S. Embassy Interview?

Only the foreign fiancee is required to undergo a medical exam and attend the U.S. Embassy Interview in order to receive the K1 Fiancee visa. Sponsors are not required and there are no interviews in the U.S. for them to attend also. If the U.S.Citizen sponsor would like to attend the U.S Embassy Interview with the fiancee in the Philippines then in many cases, it is helpful, but not required.