Is it prescribed for those residing in lands of disbelief to appoint an amir to whom they refer?

Question : Shaykh, may Allah bless you, what do you say about those who currently reside in lands of disbelief for trade or the like? Do not the residents, O Shaykh, have an obligation to appoint an amir whose opinion they follow, to whom they return in their disputes, and who judges between them so that...

Answer : As for him being a reference for them in their problems, there is no harm in that. But as for general judgment, no. If they appoint an amir on the condition that he applies the Shari'ah under this disbelieving government, appearing to oppose the state, that is not permissible, because he throws himself into destruction. But in their private problems, there is no harm in appointing him, for example, as a mufti.