[mvpel]

Mexico must have neglected to read Article 2, paragraph 4 of the UN Charter:

4. All Members shall refrain in their international relations from the threat or use of force against the territorial integrity or political independence of any state, or in any other manner inconsistent with the Purposes of the United Nations.

[TomGuy]

Or Mexico is relying on this SSP provision:

"Stimulate and accelerate cross-border technology trade by preventing unnecessary barriers from being erected (e.g., agree on mutual recognition of technical requirements for telecommunications equipment, tests and certification; adopt a framework of common principles for e-commerce)."

The above quote is from the White House website. It seems to be a clear statement of the current Administration's intent on border issues.
Security and Prosperity Partnership of North America Prosperity Agenda

[Hazcat]

Mexico must have neglected to read Article 2, paragraph 4 of the UN Charter: 4. All Members shall refrain in their international relations from the threat or use of force against the territorial integrity or political independence of any state, or in any other manner inconsistent with the Purposes of the United Nations.

It's the second part of that clause that the Mexicans are counting on '...or in any other manner inconsistent with the Purposes of the United Nations." The purpose of the UN is to destroy the sovereignty of the US>