From NBC's Domenico Montanaro
Romney has gone after Giuliani on illegal immigration and this question opened up the back and forth. Romney went after Giuliani saying he did run a sanctuary city and cited his undocumented workers being welcome in New York quote from the 1990s.
Giuliani said Romney's house was a "sanctuary mansion," that he employed illegal immigrants. Romney took umbrage and shot back.
It was definitely the most fiery we've seen the candidates at a debate.
Also, is this a replay of the Democratic debate... where the two front runners dominated going after each other and then were booed off to move on?