“It is reasonable to expect that President Trump and his choice for attorney general, Jeff Sessions, will dismantle at least some of what their predecessors leave behind. Based on what they have said, the Trump-Sessions Justice Department may well roll back federal oversight of troubled police forces, escalate the war on drugs, enlarge the share of the corrections business that goes to private companies, accelerate deportations of undocumented immigrants and use the threat of financial sanctions to challenge so-called sanctuary cities.”