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Situational awareness: President Trump officially issued his first veto this afternoon, rejecting a resolution overturning his decision to declare a national emergency on the southern border. Details.

1 big thing: White supremacist terror

The New Zealand national flag is flown at half-mast. Photo: Marty Melville/AFP/Getty Images

49 people are dead in New Zealand, a month after an American Coast Guard lieutenant was arrested for plotting a domestic terror attack and five months after 11 were killed by a Neo-Nazi in Pittsburgh.

  • The shooter identified himself via his manifesto as a 28-year-old white supremacist and Australian, per the Associated Press, and said he aimed "to avenge attacks in Europe perpetrated by Muslims."

Why it matters: The world has a white supremacy problem, radicalized online and fueled by tech platforms that have proved unable to prevent themselves from being used as hosts for first-person shooter videos and manifestos.

Details via Axios tech editor Scott Rosenberg:

  • The shooter's 17-minute Facebook Live video, shot from a head-mounted camera, appears to have been taken down soon after it was posted, but versions of it continued to crop up on YouTube and Twitter for hours afterwards, often autoplaying on visitors' screens.
  • The video's perspective put viewers in the shooter's shoes in the manner of a first-person shooter game, but with the sickening awareness that it was a real document of the murder of at least 49 people.
  • The killer's manifesto referenced white-supremacist memes and themes that have long circulated in far-right discussion spaces.

What they're saying:

  • The whole operation seemed to have been "engineered for maximum virality," as Charlie Warzel put it in The New York Times.
  • The New Zealand killer's media tactics represent a kind of white-supremacist mirror image of the approach ISIS crafted to spread its cause, NBC's Ben Collins pointed out.
  • Peter Kafka in Recode: "The platforms... did exactly what they’re designed to do: allow humans to share whatever they want, whenever they want, to as many people as they want."

The big picture: These terrorists are increasingly targeting places of worship.

  • 2012: White supremacist kills 6 at Sikh temple in Oak Creek, Wisconsin
  • 2015: White supremacist kills 9 at historic black Christian church in Charleston
  • 2017: White supremacist kills 6 at Islamic mosque in Quebec City
  • 2018: White supremacist kills 11 at Jewish synagogue in Pittsburgh
  • 2019: White supremacist kills 49 at Islamic mosque in Christchurch

The bottom line: President Trump today, on whether he sees white supremacy on the rise...

  • “I don't really, I think it’s a small group of people.”
2. What you missed
  1. Youth demonstrations and school walkouts are happening around the world to demand action on climate change. The latest.
  2. Former Trump campaign aide Rick Gates is cooperating with special counsel Robert Mueller on "several ongoing investigations," prosecutors said in a court filing, and his sentencing has been put on hold. Details.
  3. Beto O'Rourke belonged to a hacker group called Cult of the Dead Cow in the late 1980s, Reuters reports. His pretend name.
  4. Mexican smugglers are helping Guatemalan migrants get to the border faster, per the Washington Post. How it works.
  5. The FAA is being criticized for letting safety inspections be conducted by employees of airplane manufacturers — a system that's drawing new scrutiny after the Boeing 737 MAX jet crashes, AP reports.
3. 1 pup thing

What a dog sees, according to the California Science Center (Richard Vogel/AP)

An exhibit opening tomorrow at the California Science Center in L.A. lets human experience what a dog sees and smells, AP's John Rogers writes:

  • One stop includes a replica of a fire hydrant, with a button that you can push to smell what a dog smells.
  • "A dog can tell what dog was there, what time they were there and actually which direction they were going," said Jeffrey Rudolph, the center's president.

Other stations allow people to see like a dog does — their color vision is limited, but they pick up motion better than us.

  • "Dogs! A Science Tail" will travel to museums across the country after it closes in Los Angeles early next year.