A foreign country, Mexico, is undermining our sovereignty. End of discussion.
No, it's not. Citizens from said country are entering the country illegally. The difference is that it is not an act of the Mexican government itself. Unless you think the Mexican government should quash any attempts to leave their 'lovely' country. What am I saying? As a nationalist who believes the federal government has a right to interfere into the business and daily lives of the citizens of the respective states of course you would believe that...