Donald Trump proposed a permanent halt to migration from all Third World countries, called for an international coalition to curb destabilizing population flows, and said immigration should be limited to merit-based entrants to preserve security, resources and social cohesion.After a November shooting attributed to an Afghan immigrant with prior CIA links and PTSD, Homeland Security Secretary Kristi Noem said the episode underscored gaps in vetting and Trump reiterated tighter vetting and prioritizing productive, integrative individuals.Critics warned the plan could harm long-term social and economic stability, pointed to aggressive ICE raids and impacts on Social Security and Medicare, and said debates over asylum, Title 42, reproductive policies and demographic strategies would intensify.