The New York Times released this story recently, explaining the genesis of Trump’s inhumane policies at the southern border:

WASHINGTON — The five U.S. attorneys along the border with Mexico, including three appointed by President Trump, recoiled in May 2018 against an order to prosecute all undocumented immigrants even if it meant separating children from their parents. They told top Justice Department officials they were “deeply concerned” about the children’s welfare.

But the attorney general at the time, Jeff Sessions, made it clear what Mr. Trump wanted on a conference call later that afternoon, according to a two-year inquiry by the Justice Department’s inspector general into Mr. Trump’s “zero tolerance” family separation policy.

“We need to take away children,” Mr. Sessions told the prosecutors, according to participants’ notes. One added in shorthand: “If care about kids, don’t bring them in. Won’t give amnesty to people with kids.”

Rod J. Rosenstein, then the deputy attorney general, went even further in a second call about a week later, telling the five prosecutors that it did not matter how young the children were. He said that government lawyers should not have refused to prosecute two cases simply because the children were barely more than infants.

“Those two cases should not have been declined,” John Bash, the departing U.S. attorney in western Texas, wrote to his staff immediately after the call. Mr. Rosenstein “instructed that, per the A.G.’s policy, we should NOT be categorically declining immigration prosecutions of adults in family units because of the age of a child.”

The Justice Department’s top officials were “a driving force” behind the policy that spurred the separation of thousands of families, many of them fleeing violence in Central America and seeking asylum in the United States, before Mr. Trump abandoned it amid global outrage, according to a draft report of the results of the investigation by Michael E. Horowitz, the department’s inspector general.

The separation of migrant children from their parents, sometimes for months, was at the heart of the Trump administration’s assault on immigration. But the fierce backlash when the administration struggled to reunite the children turned it into one of the biggest policy debacles of the president’s term…

Gene Hamilton, a top lawyer and ally of Stephen Miller, the architect of the president’s assault on immigration, argued in a 32-page response that Justice Department officials merely took direction from the president. Mr. Hamilton cited an April 3, 2018, meeting with Mr. Sessions; the homeland security secretary at the time, Kirstjen Nielsen; and others in which the president “ranted” and was on “a tirade,” demanding as many prosecutions as possible.