The homeland security secretary, John Kelly, issued a remarkable pair of memos on Tuesday. They are the battle plan for the “deportation force” President Trump promised in the campaign.

They are remarkable for how completely they turn sensible immigration policies upside down and backward. For how they seek to make the deportation machinery more extreme and frightening (and expensive), to the detriment of deeply held American values.

A quick flashback: The Obama administration recognized that millions of unauthorized immigrants, especially those with citizen children and strong ties to their communities and this country, deserved a chance to stay and get right with the law. It tried to focus on deporting dangerous criminals, national-security threats and recent border crossers.

Mr. Kelly has swept away those notions. He makes practically every deportable person a deportation priority. He wants everybody, starting with those who have been convicted of any crime, no matter how petty or old. Proportionality, discretion, the idea that some convictions are unjust, the principles behind criminal-justice reform — these concepts do not apply.