JM 9-15.650
If the fugitive has taken refuge in the country of which he or she is a national, and is thereby not extraditable, it may be possible to ask that country to prosecute the individual for the crime that was committed in the United States. This can be an expensive and time consuming process and in some countries domestic prosecution is limited to certain specified offenses. In addition, a request for domestic prosecution in a particular case may conflict with U.S. law enforcement efforts to change the "non-extradition of nationals" law or policy in the foreign country. Whether this option is available or appropriate should be discussed with OIA.
[cited in JM 9-15.600]