The House Homeland Security Committee’s Subcommittee on Border Security and Enforcement holds a hearing titled “Northern Exposure: Assessing the Evolving Threat Landscape at America’s Northern Border” at 2 p.m. ET on June 30. Witnesses: Mr. Chris Holtzer, Executive Director of Operations, Office of Field Operations, U.S. Customs and Border Protection Mr. Michael Krol, Assistant Director, Domestic Operations, Homeland Security Investigations, U.S. Immigration and Customs Enforcement Ms. Heather MacLeod, Director, Homeland Security and Justice, U.S. Government Accountability Office Mr. Jason Schneider, Acting Deputy Chief of the Operations Directorate, Border Patrol, U.S. Customs and Border Protection ...