Does the person I select as Trustee have to be a US Citizen? Does the Guardian? The Executor?

I had answered a question about the tax ramifications of a a Trustee who is not a US citizen in a separate post. The tax code does not prohibit per se a Non US Citizen from acting as a personal representative. However, the Revised Code of Washington has this to say: A nonresident may be appointed to act as personal representative if the nonresident appoints an agent who is a resident of the county where such estate is being probated or who is an attorney of record of the estate, upon whom service of all papers may be made; such appointment to be made in writing and filed by the clerk with other papers of such estate; and, unless bond has been waived as provided by RCW 11.28.185, such nonresident personal representative shall file a bond to be approved by the court. That is found at RCW 11.30.010.