Experts and advocacy groups are warning that many of the immigrants living in the U.S. without legal permission will not seek proper medical attention if they are sick as worries about the spread of the new coronavirus grow. U.S. Immigration and Customs Enforcement says it will focus deportation efforts on public safety threats and people with criminal records during the coronavirus crisis, a policy that roughly resembles its approach during President Barack Obama's final two years in office. But many immigrants remain hesitant to seek treatment.