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This photo released by the Iraqi Prime Minister's Press Office shows a burning vehicle at Baghdad International Airport following an airstrike early today. Photo via AP

President Trump, after warning three days ago that Iran would pay "a very BIG PRICE," authorized a drone strike at Baghdad International Airport that killed Iran's top general and second most powerful official, Qasem Soleimani.

Why it matters: Soleimani had cost hundreds of American lives and was among the Middle East's most feared powers. But Iran seems certain to respond, potentially further destabilizing the world's most volatile region.

  • "In killing General Soleimani," the N.Y. Times reports, "Trump took an action that Presidents George W. Bush and Barack Obama had rejected, fearing it would lead to war between the United States and Iran."
  • From the Pentagon's statement: "At the direction of the President, the U.S. military has taken decisive defensive action to protect U.S. personnel abroad by killing Qasem Soleimani, the head of the Islamic Revolutionary Guard Corps-Quds Force, a U.S.-designated Foreign Terrorist Organization."

Behind the scenes: A source in close contact with Trump administration senior national security officials tells Axios that one scenario they are especially concerned about — and have been prepared for — is Iran launching cyberattacks.

  • That's the most likely way that Iran could retaliate stateside.

The big picture: The president who wanted to bring home the troops is now engaged in the most intense conflict with Iran in recent history.

  • So much has changed — and so fast.
  • A few months ago, Trump was musing about bringing U.S. troops home from the Middle East, and to let others fight it out in the sand.
  • Now, he’s adding forces, and they’re necessarily on a war footing.

Between the lines: Trump now has to prepare for an extreme backlash from Iran — and likely intensified attacks on U.S. forces in the Middle East, and anywhere else within Iran’s planning reach.

It also means possible retaliation against U.S. allies, especially Israel, writes Axios contributor Barak Ravid.

  • Prime Minister Benjamin Netanyahu cut short a trip to Greece to return to Israel to monitor the situation.
  • It is still unclear if the U.S. gave Israel any heads up before the strike on Soleimani.
  • Israeli officials tell Ravid that Israel doesn’t know if and how Iran is going to retaliate — but, right now, the decision is to keep a low profile and not get involved in the ongoing tensions in Iraq.

Risk of world war ... CFR President Richard Haass tweets: "Make no mistake: any war with Iran will not look like the 1990 Gulf war or the 2003 Iraq wars."

  • "It will be fought throughout the region w a wide range of tools vs a wide range of civilian, economic, & military targets. The region (and possibly the world) will be the battlefield."

The bottom line: Modern wars are fought mostly with the most expensive, most difficult to recruit, train and retain: special forces. 

Go deeper: Trump's twin war threats

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Go deeper

Updated 12 mins ago - Sports

Olympics dashboard

Team USA's Simone Biles watching the women's uneven bars final at the Olympic Games in Tokyo, Japan, on Sunday. Photo: Jamie Squire/Getty Images

🚨: Simone Biles will compete in her final Olympic event

🪧: Raven Saunders says U.S. athletes planned "X" protests "for weeks"

🏅Norwegian gold medalist, U.S. silver medalist smash 400m hurdles world record

🏋️‍♀️: Transgender weightlifter Laurel Hubbard: "It gets better"

🤸: U.S. gymnast Jade Carey wins Olympic gold in floor exercise final

⚽: U.S. women's soccer team falls to Canada in semifinals, ending chances at gold

🏳️‍⚧️: Axios at the Olympics: Games grapple with trans athletesTrans athletes see the Tokyo Games as a watershed moment

Go deeper: Full Axios coverage

Raven Saunders: U.S. athletes planned "X" protests "for weeks"

Team USA's Raven Saunders makes an "X'" gesture during the medal ceremony for the Women's Shot Put at the Olympic Games in Tokyo, Japan, on Sunday. Photo: Ryan Pierse/Getty Images

Raven Saunders, the American Olympian facing a possible investigation for making a protest gesture on the podium over the weekend, told the New York Times Monday that U.S. athletes had planned "for weeks" to demonstrate against oppression.

Why it matters: Protests are banned at the Tokyo Games. Saunders told the NYT a group of American Olympians had settled on the "X" symbol, which she gestured on the podium after winning silver in the shot put Sunday, to represent "unity with oppressed people."

Study: Social media giants failing to remove most antisemitic posts

Facebook CEO Mark Zuckerberg speaking virtually during a March House Energy and Commerce Subcommittees hearing on a laptop computer in Tiskilwa, Illinois. Photo: Daniel Acker/Bloomberg via Getty Images

Five social media giants failed to remove 84% of antisemitic posts in May and June — and Facebook performed the worst despite announcing new rules to tackle the problem, a new report finds.

Driving the news: The Center for Countering Digital Hatred (CCDH) notes in its study that it reported 714 posts containing "anti-Jewish hatred" to Facebook, Twitter, Instagram, Youtube and TikTok — which were collectively viewed 7.3 million times. These "clearly violated" company policies, according to the CCDH.