If GW Bush believes he has the power to persuade Congress to make some more motion on the now 'mostly dead' immigration bill, he's huffing. GW Bush has long lost the ability to persuade period. He certainly doesn't have the juice on this issue.
The good news is that it won't be long before we have a new president. And all any of the Republican candidates needs to promise right now (meaning any of them but McCain), is that the first order of business when they get to the White House will be to build the goddamned fence. DHS is fast losing credibility on the issue because exactly 11 miles have been built out of 850. 150 miles are promised by December, but the land hasn't even been purchased yet. This is bullcrap of the highest order and everybody knows it.
As the NRO said a month ago, the conservatives have gone from 'trust but verify' to 'verify' on immigration law. That movement is not going away.
This is the road forward. Executive action.