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John Sanders, the acting commissioner of Customs and Border Protection, announced in an internal email Tuesday that he had handed in his resignation letter — effective July 5 — to acting Secretary of Homeland Security Kevin McAleenan on Monday.

Why it matters: Sanders' resignation as the administration's top border enforcer follows heightened scrutiny over the past week of the conditions at migrant children's detention centers at the southern border.

The latest: Tuesday's reshuffle continued as 2 DHS officials told the Washington Post that Trump intends to name Mark Morgan — the acting director of U.S. Immigration and Customs Enforcement — as Sanders' replacement.

Context: News broke Monday that the U.S. government had removed most children from a Border Patrol station in Clint, Texas, following reports that more than 300 children detained there were exposed to dangerous and unsanitary living conditions.

  • On Tuesday, however, administration officials said that more than 100 children had been returned to the facility after concerns about overcrowding had been alleviated, the New York Times reports. It's unclear whether Sanders' departure is connected to the recent controversy.
  • Sanders assumed the role as the head of CBP after McAleenan moved into the role of acting DHS Secretary following Kirstjen Nielsen's departure.

In his resignation letter to McAleenan, Sanders said he "quoted a wise man" who told him: "'Each man will judge their success by their own metrics.' Although I will leave it to you to determine whether I was successful, I can unequivocally say that helping support the amazing men and women of CBP has been the most fulfilling and satisfying opportunity of my career."

Go deeper: Texas Republican says conditions in immigrant centers are worst he's ever seen

Go deeper

Off the Rails

Episode 2: Barbarians at the Oval

Photo illustration: Sarah Grillo/Axios. Photo: Jim Watson/AFP/Getty Images

Beginning on election night 2020 and continuing through his final days in office, Donald Trump unraveled and dragged America with him, to the point that his followers sacked the U.S. Capitol with two weeks left in his term. This Axios series takes you inside the collapse of a president.

Episode 2: Trump stops buying what his professional staff are telling him, and increasingly turns to radical voices telling him what he wants to hear.

President Trump plunked down in an armchair in the White House residence, still dressed from his golf game — navy fleece, black pants, white MAGA cap. It was Saturday, Nov. 7. The networks had just called the election for Joe Biden.

Fringe right plots new attacks out of sight

Illustration: Aïda Amer/Axios

Domestic extremists are using obscure and private corners of the internet to plot new attacks ahead of Inauguration Day. Their plans are also hidden in plain sight, buried in podcasts and online video platforms.

Why it matters: Because law enforcement was caught flat-footed during last week's Capitol siege, researchers and intelligence agencies are paying more attention to online threats that could turn into real-world violence.

Kids’ screen time up 50% during pandemic

Illustration: Sarah Grillo/Axios

When the coronavirus lockdowns started in March, kidstech firm SuperAwesome found that screen time was up 50%. Nearly a year later, that percentage hasn't budged, according to new figures from the firm.

Why it matters: For most parents, pre-pandemic expectations around screen time are no longer realistic. The concern now has shifted from the number of hours in front of screens to the quality of screen time.