Video of the girl confronting Romney was posted on the Internet by DRM Capitol Group, a Washington consulting firm that says it serves as a “voice for undocumented youth.” The group said that the girl, a Peruvian, had been brought to the country by her parents when she was 10 years old.

Democrats have already put Romney on notice that they too plan to use his stance on immigration against him if he wins the Republican nomination as both sides try to woo the Latino vote. Romney, considered more centrist than his GOP rivals on many issues, has taken a more conservative stand on immigration than Rick Perry and Newt Gingrich.

The Democratic National Committee has said Romney has “the most extreme position in the Republican field.” And on Monday, Democrats dispatched Rep. Luis GutierrezLuis Vicente GutierrezRep. Gutiérrez: 'Complete betrayal' if Pelosi backs budget caps deal without DACA Two states of the union The immigration fight isn't really about the Dreamers — it's all politics MORE (Ill.), a vocal proponent of immigrant rights, to argue that Romney’s views on immigrants stood between him and the presidency.

“There is no route to the White House that does not go through a Latino neighborhood. Any winner in either party needs a significant proportion of Latino voters,” Gutierrez told reporters on a conference call. “When you say you want millions of us to leave the country … we will vote against you.”