When Defendant to be Remanded to Custody

The court, if the time during which the party may be legally detained in custody has not expired, shall remand such party, if it appears that he is detained in custody:

(a)By virtue of process issued by any court or judge of the United States, in a case where such court or judge has exclusive jurisdiction; or,

(b)By virtue of the final judgment or decree of any competent court of criminal jurisdiction, or of any process issued upon such judgment or decree.