By Cindy Y. Rodriguez, CNN
(CNN) - The presidential candidates discussed immigration at the Univision forum a month ago, but Tuesday night’s debate gave the hot button issues a major prime-time stage, and it wasn't pretty.
In one of the most tweeted moments, the candidates addressed audience member Lorraine Osorio's question: "Mr. Romney, what do you plan on doing with immigrants without their green cards (who) are currently living here as productive members of society?"
The candidates had trouble with Osorio's name, and people went wild on social media.
“This is a nation of immigrants," GOP nominee Mitt Romney said. "We welcome people coming to this country as immigrants. My dad was born in Mexico of American parents. Ann's dad was born in Wales and is a first-generation American. We welcome legal immigrants into this country.”