Bush removes provision requiring back taxes from illegal immigrants
(Read the whole thing)
The date on the McCain amendment is after that. He said he was putting it back.
Here’s more. This article is dated two weeks after the one you posted. Our allies in the House are talking about doing a blue-slip on the bill if it passes the Senate because of this very issue.
http://thehill.com/leading-the-news/gop-plots-blue-slip-attack-2007-05-30.html