“In the blaring sun, at least nine Democratic presidential candidates have stood on stepladders this week to peer into the migrant detention center here where approximately 2,600 teenagers are being held.

Why it matters: The immigration crisis is becoming the defining issue of the 2020 election — at least for now — as Democrats criticize not only the conditions in which these children are being held, but also the Trump administration’s handling of young migrants who have come to the U.S. with their parents.” Read more at Axios here.