Photo: Pedro Pardo/AFP/Getty Images

The Department of Defense is expected to send 800 additional troops to the United States-Mexico border as a caravan of Central American migrants travels through Mexico to reach the U.S., CNN reports.

The big picture: Though the caravan is still more than 1,000 miles away from the border, the additional troops are expected to be in place next week to add fencing and walls in an attempt to secure potential crossing points. The news comes after President Trump tweeted Thursday morning that he'd be "bringing out the military for this National Emergency."

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Updated 29 mins ago - World

Hong Kong media tycoon Jimmy Lai arrested under national security law

Media tycoon Jimmy Lai at the Next Digital offices in Hong Kong in June. Photo: Anthony Wallace/AFP via Getty Images

Hong Kong pro-democracy activist Jimmy Lai has been arrested for "collusion with foreign powers" and the offices of his newspaper raided, said Mark Simon, an executive at the tycoon's media firm Next Digital on Monday.

Why it matters: He was arrested under the new national security law that gives Beijing more powers over the former British colony. Lai is the most prominent person arrested under the law — which prompted the U.S. to sanction Chinese officials, including Hong Kong leader Carrie Lam, over Beijing's efforts to strip the territory of its autonomy.

Updated 39 mins ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 1:30 a.m. ET: 19,861,683 — Total deaths: 731,326 — Total recoveries — 12,115,825Map.
  2. U.S.: Total confirmed cases as of 1:30 a.m. ET: 5,044,864 — Total deaths: 162,938 — Total recoveries: 1,656,864 — Total tests: 61,792,571Map.
  3. Politics: Pelosi says states don't have the funds to comply with Trump's executive order on unemployment — Mnuchin says Trump executive orders were cleared by Justice Department.
  4. States: New York reports lowest rate of positive coronavirus test results since pandemic began
  5. Public health: Ex-FDA head: U.S. will "definitely" see 200,000 to 300,000 virus deaths by end of 2020. 
  6. Schools: 97,000 children test positive for coronavirus in two weeks — Nine test positive at Georgia school where photo showing packed hallway went viral .

97,000 children test positive for coronavirus in two weeks

A boy has his temperature checked as he receives a free COVID-19 test in South Los Angeles in July. Photo: Mario Tama/Getty Images

At least 97,000 children tested positive for COVID-19 in the final two weeks of July and there's been an estimated 338,000 cases involving kids in the U.S. since the pandemic began, a new report finds.

Why it matters: The findings in the report by the American Academy of Pediatrics and the Children’s Hospital Association comes as schools and day cares look to reopen in the U.S., with New York Gov. Andrew Cuomo (D) announcing Friday that school districts in the state can reopen in the fall amid lower coronavirus transmission rates.