What would be your position if a Democratic President declared that all Children must go to a Jewish kibbutz or Catholic primary school, or, funds would be withheld?     Does the public have the right or responsibility to defy an immoral directive?  (If not immigration, how about torture, gun confiscations, declaring 3 periods of prayer a day that must be given to all workers.)  
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I'm not in favor of undocumented immigration.   But our country, and a lot of personal wealth., has been built with underpaid immigrant labor.    To fail to accept that reality of America's role in open boarders, (for OUR benefit), is avoiding our nations personal responsibility for the current problems.   

P.s.   I'm OK with a public vote if you're OK accepting the results.     What happens if Portland and the Feds disagree?    

I think the issue will fall on the unfunded mandate complaints.  Local police have neither the time or money to prosecute low level immigration enforcement.