File the N-600. USCIS is obligated to weigh the evidence under the preponderance of the evidence standard, already has the evidence in your A-file, and has previously examined it and accepted it in order to grant you refugee status and permanent residence.
8 CFR 341.2 Examination upon application.
(c) Proof. The burden of proof shall be upon the claimant, or his parent or guardian if one is acting in his behalf, to establish the claimed citizenship by a preponderance of the evidence.
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To understand what the above means see:
Matter of Chawathe at:
http://www.justice.gov/eoir/vll/intdec/vol25/3700.pdf which holds, in part:
(3) In most administrative immigration proceedings, the applicant must prove
by a preponderance of evidence that he or she is eligible for the benefit sought.
(4) Even if the director has some doubt as to the truth, if the petitioner submits relevant,
probative, and credible evidence that leads the director to believe that the claim is “more
likely than not” or “probably” true, the applicant has satisfied the standard of proof.
Matter of E-M-, 20 I&N Dec. 77, 79-80 (Comm’r 1989), followed.
(5) If the director can articulate a material doubt, it is appropriate for the director to either
request additional evidence or, if that doubt leads the director to believe that the claim
is probably not true, deny the application or petition.
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Regarding CCA Sec. 320 see:
http://ecfr.gpoaccess.gov/cgi/t/tex...div8&view=text&node=8:1.0.1.3.71.0.1.3&idno=8
The above link to the regulations explains that you can rely on the evidence in your A-file that was already submitted. In the case of a Refugee, your "birth record" may consist of a document created by the UNHCR or an INS/USCIS Officer or an aid organization or third country/international refugee processing agency. It has already been accepted for immigration purposes.
The Passport Agency does not have the documentation and, in your case, will not issue you a passport without your Certificate of Citizenship because you can't obtain a birth certificate that was probably never created in the first place. Technically, the passport agency should not be issuing any derivative citizenship case passports without the Cert of Citz, as they do not have tthe legal authority to do so.
INA Sec. 104. Powers and duties of Secretary of State [Has Authority over Passport Agency]
(a) Powers and duties
The Secretary of State shall be charged with the administration and
the enforcement of the provisions of this chapter and all other
immigration and nationality laws relating to (1) the powers, duties, and
functions of diplomatic and consular officers of the United States,
except those powers, duties, and functions conferred upon the consular
officers relating to the granting or refusal of visas; (2) the powers,
duties, and functions of the Administrator; and
(3) the determination of
nationality of a person not in the United States.................................