Adding Countries to the Visa Waiver Program: Effects on National Security and Tourism [April 1, 2020] [open pdf - 1MB]
From the Introduction: "The U.S. government's Visa Waiver Program (VWP) allows eligible nationals from 39 countries to enter the United States for stays of fewer than 90 days for tourism or business purposes without applying for a visa from a U.S. embassy or consulate. [...] This report offers an overview of the VWP. It discusses the potential effects on national security and considers the likely economic effects on the U.S. travel and tourism industries if more countries were to be added to the program. The report also reviews legislative proposals in the 116th Congress related to the expansion and implementation of the VWP, and legislation targeting U.S. travel promotion--namely the Brand USA program, which is partially funded by ESTA [Electronic System for Travel Authorization]."
CRS Report for Congress, R46300
Congressional Research Service: https://crsreports.congress.gov/