Senators Ron Wyden and Claire McCaskill wrote to the US Customs and Border Protection (CBP) management. The two senators are urging the CBP to implement a plan to properly authenticate e-Passport holders and their data by January 1, 2019. Border agents have been able to read the data on the chip but not verify its digital signature for authenticity since 2007. This means foreigners could have entered the US using forged e-passports, albeit they still had to craft a convincing passport in the first place.
Source: https://www.bleepingcomputer.com/news/government/us-border-agents-didnt-verify-any-e-passports-since-2007-because-they-didnt-have-the-software/