They need TWO walls with a "no man's land" corridor between them, monitored by camera, patrolled by mounted border guards and free-roaming guard dogs. Getting over the first wall would probably be as easy as it is right now.
Getting over the second fence, not so much... they could even have a one way door in the first wall where they could gently escort border jumpers back into Mexico without all the bureaucratic red tape.
I agree. See my post at 22.
Having actual consequences for being here illegally will be cheaper and more effective against illegal aliens from all nations. By consequences I mean NEGATIVE consequences, not section 8 housing, free health care, etc. Simply showing a resolve to enforce our laws will get rid of the vast majority, most of whom do not walk across a border. A wall is a fine idea but it is an inanimate object easier to point to on TV and avoids blaming the true source of the problems - lack of political resolve to enforce our laws.