Democratic Senator Chris Van Hollen of Maryland is in El Salvador to call for the release of Kilmar Armando Abrego Garcia.

A Maryland man’s efforts to return to the US after being mistakenly deported to El Salvador last month hit a major new roadblock on Monday when the country’s president vowed to keep the father of three locked in a notorious mega-prison.

The U.S. State Department announced in an April 12 court filing that Kilmar Abrego Garcia is ‘alive and secure’ in an El Salvador prison — or ‘Terrorism Confinement Center’ — after the U.S. resident was mistakenly deported from Maryland in March.