WATCH: Dem scolds Homeland Security chief to ‘calm down’ after hearing derails over alleged ‘pattern’

A Senate Appropriations Committee hearing was disrupted by a heated exchange between Sen. Chris Van Hollen and Homeland Security Secretary Markwayne Mullin over allegations of a 'pattern' of abuse in immigration enforcement. Van Hollen cited recent DHS-involved shootings and pressed for evidence sharing with state authorities, while Mullin denied a pattern exists. Sen. Chris Murphy also criticized DHS spending and compliance with court orders.