That will never happen. If OUR government does not have the will or inclination to do the right thing now...i.e. effective border control, rigorous enforcement of our immigration laws, it won't have the will or inclination to do so after an amnesty. As others have mentioned, our government made similar promises to sell the 1986 amnesty to a skeptical public and looked what happened. Sorry, our so-called leaders have no credibility on this score whatsoever.
And when the government tells us that it will start getting tough on illegal immigration after an amnesty program is enacted that is tantamount to extortion. The message is: “If you don’t give us what we want, we are going to continue to leave America open to this invasion and do nothing about it”. Would you trust such a government and their promises? What we really have in this country is an out of control tyrannical government.
They should have been applying the law and constitution as pertaining to "invasions" for decades now. That our government won't protect America from an Invasion tells you everything you need to know about its leaders. And no, they don't keep their promises. If Bush gets his way there will be a lot of back slapping laughter in the WH and halls of Congress on how they suckered the people again. No More.
You said it well...you said it all.