Congress needs to overhaul U.S. immigration policy to strengthen national security and thwart potential terrorist attacks, according to a Bipartisan Policy Center and Chicago Council on Global Affairs report set to be released Friday.

“There is no doubt that we are safer now than before Sept. 11, 2001. Our systems for screening travelers are careful and thorough,” said Michael Chertoff, former Homeland Security secretary and co-chairman of the center’s immigration task force. “But that does not mean we can perfectly detect whether every traveler might be a secret extremist or might eventually become radicalized. The common-sense proposals in this report would enhance our ability to focus on the real threats who may seek to enter our country.”