"We must work together to shift resources to areas like the Tucson Sector which face continuing heavy illegal trafficking of people and drugs," he said.
The report found that border arrests have been dropping since 2006, although it said that matches an economic-driven decrease in known illegal border crossings. But it also found that drug seizures nearly doubled from 2006 to 2011.
Barber said the Tucson sector of the border is just 13 percent of the total border with Mexico, but accounts for more than a third of all drug seizures and apprehensions between the U.S. and Mexico.
Barber said he would hold two briefings on the GAO report in Arizona, on Jan. 28 and 29.