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Students are reunited with their parents at the Highlands Ranch Recreation Center. Photo: Helen H. Richardson/MediaNews Group/The Denver Post via Getty Images

Many 2020 presidential hopefuls have reacted to the shooting at STEM School Highlands Ranch in suburban Denver Tuesday, with several stressing their pledges to change gun laws.

Details: The White House called it a "hateful and horrible" act of violence and said President Trump was monitoring the situation. Here's how 2020 presidential candidates reacted.

What the presidential candidates are saying:

  • Sen. Elizabeth Warren: She tweeted, "Heartsick for the victims, their loved ones, and the Highlands Ranch community. How many more of our children’s schools must be torn apart by gun violence until Congress does something? We need gun reform. Now."
  • Sen. Cory Booker: He tweeted, "My heart aches. Another day, another school shooting. Every hour we wait more people are murdered—we have to pass comprehensive gun safety reform."
  • Southbend, Indiana, Mayor Pete Buttigieg: He tweeted, "We have to solve the mass shooting epidemic. We — especially our students — should all feel safe in our communities. I’m praying for the students and families from STEM School Highlands Rach, and will not rest until we deliver common-sense gun reform."
  • Sen. Kirsten Gillibrand: She tweeted, "Another school shooting. Another life cut far too short. Another family and community changed. Forever. How many more will it take? I’m holding Highlands Ranch in my heart tonight. This can’t go on."
  • Sen Kamala Harris: She tweeted, "How many more children have to watch their classmates get shot before Congress and the White House act?"
  • Former Texas congressman Beto O'Rourke: He tweeted a video post of an interview on gun violence alongside his comments, "Yesterday, a 14-year-old told me she was afraid that she would be shot in her classroom. Today, students in Highlands Ranch were shot in theirs. We are not doing enough to protect the lives in our lives. We must take action now to stop gun violence in our communities."
  • Sen. Amy Klobuchar: She tweeted, "My heart goes out to the victims & their families at the STEM School Highlands Ranch, just eight miles away from Columbine High School. This has to stop. We must pass federal laws to end gun violence."
  • Rep. Eric Swalwell: He tweeted: "One thing we can all agree on: This should not be a child's reality. #EnoughIsEnough #STEMShooting"
  • Rep. Seth Moulton: he tweeted, "This is the only country in the world where this happens regularly. Everyone else has figured it out — there should be no reason we haven’t."
  • Washington Gov. Jay Inslee: He tweeted, "My heart goes out to the Highlands Ranch community and the families of those injured. Every person in America should feel safe at school, the movies, nightclubs, their place of worship — everywhere. Aggressive gun safety reform is the only answer."
  • Former HUD Secretary Julián Castro: He tweeted, "We’ve lost another young person today, and seven more injured. This is not the nation we set out to become. We are losing our children to gun violence. They are our future, and we must do better to protect them."
  • Sen. Michael Bennet: He tweeted, "Heartbroken for this student’s family, loved ones, and classmates, and for everyone affected by today’s tragedy. This sickening reality has become too normal for our children. They deserve better. We have to do better. "
  • Venture for America founder Andrew Yang: He tweeted, "Every shooting hurts. Let’s do something about it while it still hurts. The danger is we become numb and it becomes commonplace. We can do much more - we owe it to the next generation to rise to the challenge of school shootings via both improved mental health and gun safety."
  • Former Gov. John Hickenlooper: He tweeted, "My heart is with the parents, students, and faculty of @stemschoolHR , and the first responders who rushed to their aid. This is every parent's nightmare, and it's becoming every child's nightmare as well. We can't just accept this. We have to end this epidemic of gun violence."
  • Miramar, Florida, Mayor Wayne Messam: He tweeted: "Until this nation decides to have the political will to change the course of inaction, more tragedies are certain. I believe America can act and I believe these tragedies can end. I have the political will to fight for this. #ChangeCantWait"
  • Spiritual leader, author and activist Marianne Williamson: She tweeted, "Another school shooting in Denver. Once again our NRA-owned senators & congressmen will offer thoughts & prayers & yet do nothing. I pray for the victims & for those who love them. And I pray for forgiveness for a country that puts gun sales before the safety of our own children."

Go deeper

Updated 6 hours ago - World

UK government: Kremlin has plan "to install pro-Russian leadership" in Ukraine

British Foreign Secretary Elizabeth Truss. Photo: Gints Ivuskans / AFP via Getty Images

The United Kingdom's Foreign Secretary on Saturday night said the government has "information that indicates the Russian Government is looking to install a pro-Russian leader in Kyiv as it considers whether to invade and occupy Ukraine."

Driving the news: U.S. National Security Council spokeswoman Emily Horne called the intelligence "deeply concerning" in a statement to Axios. The Biden administration has said Russia is actively manufacturing a pretext for invasion and warned that Putin could use joint military exercises in Belarus as cover to invade from the north.

Updated 7 hours ago - Science

This powerful new accelerator looks for keys to the center of atoms

Illustration: Eniola Odetunde/Axios

Nuclear physicists trying to piece together how atoms are built are about to get a powerful new tool.

Why it matters: When the Facility for Rare Isotope Beams begins experiments later this spring, physicists from around the world will use the particle accelerator to better understand the inner workings of atoms that make up all the matter that can be seen in the universe.

Updated 7 hours ago - Politics & Policy

Omicron dashboard

Illustration: Aïda Amer/Axios

  1. Health: FDA OKs antiviral drug remdesivir for non-hospitalized COVID patients — Walensky: CDC language "pivoting" on "fully vaccinated" — Pfizer and Moderna boosters overwhelmingly prevent Omicron hospitalizations, CDC finds.
  2. Vaccines: The case for Operation Warp Speed 2.0 — Teens and adults missed 37 million vaccinations during COVID — Team USA 100% vaccinated against COVID ahead of Beijing Olympics — Kids' COVID vaccination rates are particularly low in rural America — Annual COVID vaccine preferable to boosters, says Pfizer CEO.
  3. Politics: Arizona governor sues Biden administration over COVID funds tied to mandates — Biden concedes U.S. should have done more testing — Arizona says it "will not be intimidated" by Biden on anti-mask school policies.
  4. World: American Airlines flight to London forced to turn around over mask dispute — WHO: COVID health emergency could end this year — Greece imposes vaccine mandate for people 60 and older — Austria approves COVID vaccine mandate for adults — Beijing officials urge COVID-19 "emergency mode" before Winter Olympics.
  5. Variant tracker