How important is it that our elected officials ONLY serve the interests of the USA, rather than change the USA to serve another country?

sites.google.com/site/ufirenow/Home/misc-informati...ation

Ms. Robles is making a call for mass demonstrations in the United States to benefit the cause of amnesty for illegal immigrants in the United States. She is doing so while holding an appointed position within the Utah state government through official channels of the Mexican government. When making such a call, as a representative of the Mexican government, is Luz Robles serving the United States or Mexico?
https://chumly.com/n/124384f