Illegal immigration refers to the movement of individuals across borders in violation of destination country laws, often driven by economic inequality, the situation of asylum seekers, or familial connections. Authors such as George W. Bush highlighted its pressure on public resources and the need for border security, while Donald Trump associated it with criminal organizations and structural weaknesses.
Barack Obama criticized its effect on workers' competitiveness, supporting regulated legal immigration. These viewpoints underscore the complex interplay of legality, ethics, and policy challenges, revealing how discussions around unauthorized migration intertwine with broader debates on sovereignty, human rights, and economic fairness.