I am being served a subpoena in a federal criminal case against my partner. What are my rights?

You should consult your own attorney immediately. Spousal privilege is recognized in some states as common law but since you are not married that probably will not apply. The 5th amendment usually applies only to statements made that may tend to incriminate you or to implicate you in some way in a crime. If you appear and choose not to answer questions the court can compel you to answer and if you refuse, find you in contempt of court, jail you and hold you until you testify. There are ways to file Motions to Quash a Subpoena prior to appearing. Again the best way to get your answer is seek the help of a federal criminal lawyer in your area.

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I concur with Mr. Henry. You need to consult an experienced criminal defense lawyer admitted to practice in WA as soon as possible, regarding whether WA recognizes common law marriage as being the equivalent of a civil union; and, if so, under what circumstances you can move to quash the subpoena. Respectfully, this should not be the same atty used by your partner. The 5th Amendment right does apply to criminal cases, but in order to invoke it, you need to be able to assert a cognizable claim that by being forced to testify you will be inculpating yourself. Again, you need to talk to an experienced criminal defense lawyer ASAP.

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This answer does not, nor is it intended to, create an attorney-client relationship; or, constitute either legal advice or attorney advertising. Rather, given the nature of this forum, it is offered solely for information purposes, as a starting point for you to use when speaking directly to a lawyer in your State. Since the facts of each case are different, it is critical for you to consult with qualified counsel with whom information can be shared and assessed under an attorney-client privilege, so that competent advice can be obtained on which you can make informed decisions. Do not presume that the law of the State where I practice will apply to the circumstances you are faced with in the State where you are charged. Contact an experienced criminal defense lawyer admitted to practice in your State before making any decisions about your case.

You need to consult with a criminal defense attorney that practices in federal court. Good luck!