Napolitano said the administration is "attacking" the challenges along the southwest border but that a more comprehensive, legislative solution to the country's immigration and border woes must not hinge on Republicans' arbitrary measure of border security.
"The notion that you're going to somehow seal the border and only at that point will you discuss immigration reform – that is not an answer to the problem," she said.
"The border is as secure now as it's ever been, but we know we can always do more and that will always be the case," she said. "It's a big border. It is 1,960 miles across that southwest border. It's some of the roughest, toughest geographical terrain in the world across that border… You're never going to totally seal the border."