There were certainly reports of children who listed American immigration policy as having prompted their solo journeys. The Obama administration’s clarification that the minors were not eligible for DACA also suggests a need to swat away the notion. And researchers have noted the possibility that DACA might have given migrants hope that the United States could provide future reprieve from deportation.

Still, it’s a stretch to say DACA was the single or even the main motivating factor behind the surge in migrant children reaching the border. For one, Salvadoran, Guatemalan and Honduran applications for asylum to other Central American countries increased by 1,185 percent from 2008 to 2014, showing that the children were seeking relief not only in the United States.

More significant drivers of the migration were violence, poverty, gang presence, economic opportunity and the desire to be reunified with family, and “it remains unclear if, and how, specific immigration policies have motivated children to migrate to the United States,” according to a 2014 Congressional Research Service report.

Department of Homeland Security data also shows that the surge in unaccompanied minors preceded President Barack Obama’s June 2012 DACA executive order. The number of apprehensions began to rise in January 2012 and plateaued from June 2012 to January 2013, before increasing and then peaking in May and June of 2014.

The evidence that DACA recipients have displaced native-born workers is lacking.

According to Mr. Trump’s press secretary, Sarah Huckabee Sanders, more than four million unemployed Americans in the same age group as DACA recipients “could possibly have those jobs” held by DACA recipients. And Mr. Sessions was more emphatic: The executive order “denied jobs to hundreds of thousands of Americans by allowing those same jobs to go to illegal aliens.”

While it’s certainly possible that there are individual cases of an employer hiring a DACA recipient instead of an American citizen, the claim of a widespread trend is unproved.