President Donald J. Trump signed an executive order Wednesday declaring a national emergency at the U.S.-Mexico border, citing record levels of illegal immigration, human trafficking, and drug smuggling as the basis for immediate action.

Trump's immigration policy changes drew the most attention at DHS, but he is also making changes at the rest of the massive agency. Members of the Aviation Security Advisory Committee received a memo Tuesday saying that the department is eliminating the membership of all advisory committees as part of a “commitment to eliminating the misuse of resources and ensuring that DHS activities prioritize our national security.