A new Gallup Poll shows that more than three-quarters of Americans are aware of Arizona's new immigration law and that 51% of them support its tough measures and 39% are opposed.

Nearly a quarter (22%) of the 1,013 adults surveyed said they did not know about the law.

Breaking the results down along party lines, 62% of Republicans favor the law, compared with 27% of Democrats and 37% of self-declared independents.

The legislation, signed into law Friday by Gov. Jan Brewer, makes it a state crime to be in the United States illegally and directs Arizona law enforcement to question and detain people suspected of being in the country illegally.