Allow me to clarify for the simple-minded. "Mexico" can refer to two things:
- The United States of Mexico, a sovereign republic located south of the USA.
- The Mexican nation, sometimes called La Raza
The former is limited to providing consular assistance outside its borders. The latter is an idea, a sense of identity, and has no borders.
The anti-immigrant Right is prone to distort meanings and invent outright lies (listen to them talk about criminal tendencies among immigrants!), consider this yet another one. Calderon made a statement of solidarity with the Mexican nation overseas, and the boors are taking it to mean that a developing state is trying to conquer the world.