Final answer:
An interpreter is not required for an English-speaking client from the U.S. who is hard of hearing and prefers to lip-read, as they can communicate effectively in English without interpretation assistance.
Step-by-step explanation:
The situation in which an interpreter is not required is when an English-speaking client from the U.S. who is hard of hearing does not know American Sign Language and prefers to lip read. This client has the ability to understand and communicate in English without the need for an interpreter to facilitate the communication process. Providing an interpreter in such circumstances, where the client can comprehend through lip-reading and does not request additional assistance, would be unnecessary.