A memorial for victims of the Pulse nightclub shooting in Orlando. Photo: Spencer Platt/Getty Images

Mass gun violence is one of the top threats to safety and security in America, Janet Napolitano, former Homeland Security secretary, tells "Axios on HBO."

What's happening: The U.S. has more mass shootings than any other country in the world. Napolitano notes that federal resources are steered toward shootings motivated by “terrorist ideology,” but most are simply treated as “a local crime, a state crime.”

Even in cases where suspects have been radicalized, they're difficult to identify in part because there's often no broader conspiracy to uncover.

  • "They're just radicalized in their mind to the point where they go out and buy weapons with immense firepower and take them to a nightclub [or] shoot from a hotel room," she says.
  • The government needs to “identify individuals who are susceptible to such self-radicalization and almost treat it like a public health issue,” while adding “reasonable gun safety measures,” Napolitano adds.

Our thought bubble, per Axios' Stef Kight: There is a generation of young people with little memory of foreign terrorist attacks such as 9/11, but who have grown up witnessing their peers killed by domestic terrorists. These young people will soon be voters.

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Elliott Abrams to replace Brian Hook as Trump's Iran envoy

Brian Hook. Photo: Tayfun Coskun/Anadolu Agency via Getty Image

President Trump's Iran envoy, Brian Hook, is stepping down, Secretary of State Mike Pompeo confirmed Thursday. He will be replaced with Venezuela envoy Elliott Abrams, a noted Iran hawk who will serve in both roles.

Why it matters: Hook had been tasked with executing Trump's "maximum pressure" policy toward Iran, working closely with Pompeo. That strategy has deepened tensions and thus far failed to force Iran back to the negotiating table, as Trump had hoped.

Ohio Gov. Mike DeWine tests positive for coronavirus ahead of Trump visit

Photo: Justin Merriman/Getty Images

Ohio Gov. Mike DeWine (R) has tested positive for COVID-19 and plans to quarantine at his home for the next 14 days, his office announced Thursday. He currently has no symptoms.

Why it matters: The 73-year-old DeWine was set to meet President Trump Thursday on the tarmac at an airport in Cleveland and was tested as part of standard protocol. He is the second governor known to have contracted the coronavirus, after Oklahoma Gov. Kevin Stitt (R).

Updated 1 hour ago - Politics & Policy

Coronavirus dashboard

Illustration: Eniola Odetunde/Axios

  1. Global: Total confirmed cases as of 12:30 p.m. ET: 18,860,908 — Total deaths: 708,676— Total recoveries — 11,394,821Map.
  2. U.S.: Total confirmed cases as of 12:30 p.m. ET: 4,834,546 — Total deaths: 158,445 — Total recoveries: 1,577,851 — Total tests: 58,920,975Map.
  3. Politics: Pelosi rips GOP: "Perhaps you mistook them for somebody who gives a damn" — Ohio Gov. Mike DeWine tests positive.
  4. Public health: Fauci says task force will examine aerosolized spread.
  5. Business: July's jobs report could be an inflection point for the recovery — Teladoc and Livongo merge into virtual care giant.
  6. Sports: Where college football's biggest conferences stand on playing.