Along with a news report in which McCain warns GOP candidates about their rhetoric about ("illegal") immigration, Mickey Kaus notes an interview McCain's given to Hannity in which he again does not explicitly say he would veto a McCain-Kennedy-style immigration bill if it came to his desk as president and places his faith in the border state governors to testify that the border is "secure" (presumably before some "comprehensive" reform can be initiated). Kaus thinks that McCain's using a "gimmick designed to let him shift to pushing for an illegal immigrant legalization bill shortly after he's actually elected."
McCain seems to be sharpening his tongue against GOP dissent from his position on immigration. In his warning to the candidates, he claims that Jim Oberweis in his (failed) effort to replace former Speaker Hastert embraced "very strong anti-immigrant rhetoric." In his campaign website's discussion of border security, Oberweis says that "America is a land of, by, and for immigrants."