Van Hollen, 66, got his start in politics as a staffer for former Maryland U.S. Sen. Charles Mathias in the 1980s, going on to staff the Senate Foreign Relations Committee and, later, Maryland Gov. William Donald Schaefer.

Maryland Sen. Chris Van Hollen’s diplomatic mission to El Salvador culminated in a face-to-face meeting with Kilmar Abrego Garcia, the mistakenly deported man whose case has inflamed national