Giuliani steps up criticism of immigration bill

John McCain has already gotten it from all sides on his new Senate immigration bill. Now he's getting it from Rudy Giuliani, too.

The former New York mayor, whose criticism of the bill had been muted, had harsh words for the plan in tonight's debate. Giuliani said the bill contained too many compromises and that "it is quite possible that it will make things worse." Giuliani said that he was concerned about, among other things, the lack of a uniform database of non-citizens in the United States.

McCain responded as he usually does -- by challenging his opponents to craft something better, and by arguing that leadership sometimes involves making sacrifices and compromises.

"It's our job to do the hard things," McCain said.

Mitt Romney, a persistent critic of McCain's immigration bill, reiterated his opposition to an aspect of the legislation that would establish a special visa for the estimated 12 million immigrants living the country illegally.