After Jan. 20, the Biden administration and the Democratic Congress will face urgent calls to act on several fronts. Few issues will require more immediate action than immigration. The deterrence of immigration through cruelty was perhaps President Trump’s single most successful set of policies. For four years, Trump put in place hundreds of draconian measures to dissuade immigration to the United States, persecuting undocumented families and young “dreamers” and abusing the rights of thousands seeking asylum.