The Department of Homeland Security is undergoing the longest federal shutdown in U.S. history due to deep Republican divisions and unclear White House guidance, with Senate and House leaders unable to agree on funding measures. The shutdown has caused operational disruptions at airports and intensified partisan blame, while some Republicans and former President Trump have called for ending the filibuster to pass funding without Democratic support. Meanwhile, tensions in the Middle East escalate as President Trump threatens severe actions against Iran amid stalled peace talks, raising concerns about further military conflict and global economic impacts.