Emergency Supplemental Appropriations for Humanitarian Assistance and Security at the Southern Border Act, 2019 This bill provides $4.59 billion in FY2019 emergency supplemental appropriations to federal departments and agencies for humanitarian assistance and security to respond to migrants attempting to enter the United States at the southern border. The funding provided by this bill is designated as emergency spending, which is exempt from discretionary spending limits. The bill provides appropriations to the Department of Justice for the Executive Office for Immigration Review and the U.S. Marshals Service; the Department of Defense for the Operation and Maintenance accounts of the Army, Marine Corps, Air Force, and Army National Guard; and the Department of Health and Human Services for the Administration for Children and Families. Within the Department of Homeland Security, the bill provides appropriations for U.S. Customs and Border Protection, U.S. Immigration and Customs Enforcement, and the Federal Emergency Management Agency. The bill also sets forth requirements and restrictions for using funds provided by this bill.