You want to protest and wear the flag of another country, be it Mexico, Pakistan, Somalia, etc.? Go live there, if you think their country is so great. At the same time ask yourself why they are here: Is it to do harm to our country or for a better life? If it is for a better life then they damn well better be assimilating: come in legally, have sufficient money for living (housing, food, and health care), speak English, and give up previous citizenship. We see too many times our own members of Congress not assimilating, and holding dual citizenship. Dual citizenship must make them ineligible for any governmental job.