🚀 go-pugleaf

>Assuming this is in the United States; it probably nulifies the need for 
>a second ID because the process for obtaining a passport already 
>requires that you provide ID before you can get a passport. If you are 
>looking for an official answer, ask the next time this request is made 
>of you. A passport also proves citizenship.

Read form I-9.  You need to prove identity and eligibility to work
(citizenship).  A passport and some other documents prove both.

>> Wouldn't a driver's license alone also tell them you are a legal US
>> citizen?  In spite of what former governor Davis tried to do. 
>
>Citizenship is not required in order to obtain a drivers license; only 
>proof of legal residence is.
>
>> Also, the passport can be expired and still used, which is what I
>> did.  Is that because it's impossible to be a citizen and then stop
>> being one?
>
>Policies excepting an expired passport are entirely up to the agency who 
>requests the ID. 

Assuming this is the United States, and "agency" refers to an
employer or employment agency, not a government agency, NO, individual
employers are NOT allowed to decide what ID to accept (add to or
subtract from the acceptable ID lists).  Form I-9 says that passports,
unexpired or expired or acceptable.  So are "green cards".  Accept
one but not the other and you'll probably be accused of employment
discrimination.

>It is possible to switch citizenship from one country 
>to another. It is also possible to hold citizenship in more then one 
>country at a time.

Apparently there aren't enough of these to worry about someone
slipping through the cracks.  If you renounce USA citizenship, you
aren't too likely to try to come back and get a job here.