The article.
WTF? Regardless of how you feel about legal immigration, illegal immigration, amnesty, etc...what right does one country have to essentially tell another that it can't build a fence in an attempt to secure its borders? I'm assuming that there will still be places where people and goods can LEGALLY cross the border, so it seems like the only reason to complain about the building of the fence is because it will make it more difficult to transport people and goods ILLEGALLY across the border.
Is there any legal tactic that can be used to prevent the USA from building this fence?