Americans are now more concerned about illegal immigration than they are about the health of the U.S. economy, according to a new report from Gallup.

The survey, which was conducted from Aug. 7-10 and has a margin of error of plus or minus 4 percentage points, found that 18 percent of 1,032 U.S. adults aged 18 and older believe out-of-control government is the biggest problem facing the country.