Ha! That statement is absolutely ludicrous. If his intent was to stop terrorism, we who live on the border would have actually observed some sort of security enhancement along the border. Instead we've seen an increase of people crossing it from who knows what country and we've seen the Border Patrol unable to stem the flow.
The President's current policies on the border are based upon his irrational fear of angering potential Hispanic voters and some weird pandering to Vincente Fox. It is as if Fox has something he's holding over Bush, but I can't figure out what it is. Did Bush go to Mexico on a Spring Break bender decades ago and Fox got ahold of some incriminating photos or something? Heck I can't explain what would cause Bush to bow to Fox's wishes every time, that explanation is as good as anything else. But, it is certainly NOT evident that Bush's border policies are designed to stop terrorism.
Doubt the patriotism and integrity of President Bush all you want to. You are in good company with the DNC, Michael Moore, Ralph Nader, and the Stalinists of ANSWER.
What I actually think it could be --- from observing every time a corrupt Mexican official brings up the "guest worker amnesty" plan they not so subtly bring up "our national security" --- as if the two are tied somehow. We open the borders to all Mexicans and those borders become somehow more secure. It doesn't make sense except that they must be threatening that they can just as easily work a deal with Al Queda if we don't give them what they want. Extortion.