Donald Trump's immigration policies aimed to increase enforcement and restrict immigration, including pushing for laws with mandatory minimum sentences for undocumented immigrants, rolling back birthright citizenship, banning immigration from several Muslim-majority countries, and building a wall along the US-Mexico border. These policies generated controversy and opposition from sanctuary cities like Los Angeles and Malibu that did not want local police enforcing federal immigration laws due to concerns it could damage trust with immigrant communities and hinder police work. The document discusses the specific immigration and border security proposals put forth under Trump and the resistance from some communities.