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Photo: Chip Somodevilla/Getty Images

The market did not take Trump's Mexico tweet well.

Our thought bubble, via Axios' Felix Salmon: Strategically, it makes zero sense for the U.S. to enter a two-front trade war, engaging Mexico even as the confrontation with China is reaching a boiling point. China and Mexico are 2 of America's 3 largest trading partners. To start trade wars with both of them is a declaration of isolationism not seen since 1945.

By the numbers:

  • The Mexican peso fell almost 2% against the dollar to its lowest value since early March.
  • Yields on the 2-year U.S. Treasury note dropped below 2% for the first time since February 2018, and to the lowest since September 2017 on the benchmark 10-year note.
  • S&P 500 futures were lower by 1.2%, London's FTSE 100 fell more than 1%.
  • Chinese shares were slightly lower, falling by around 0.2%. Germany's DAX was off by more than 1.5%.
  • Shares of Ford lost 4% in pre-market trade. GM dropped more than 5%.

Be smart: "Imposing these tariffs is in principle, not allowed under the free trade agreement currently in place between Mexico and the United States or under WTO general frameworks," wrote Tania Escobedo, strategist at RBC Capital Markets.

  • "It is likely, however, that Trump will claim the measure is a matter of national security, referring to the International Emergency Economic Powers Act (IEEPA)."

Go deeper: Trump's Mexico tariffs could decimate the auto industry

Go deeper

Bryan Walsh, author of Future
Updated 6 hours ago - Technology

A dark view of the future of autonomous weapons

A still from the video "If Human: Kill ( )." Image: Future of Life Institute

A new short film warns of the coming risks posed by the development and proliferation of lethal autonomous weapons.

Why it matters: Drones with the ability to autonomously target and kill without the assistance of a human operator are reportedly already being used on battlefields, and time is running out to craft a global ban of what could be a destabilizing and terrifying new class of weapon.

Updated 6 hours ago - Politics & Policy

Omicron dashboard

Illustration: Shoshana Gordon/Axios

  1. Health: Coronavirus variant surveillance varies widely by state — Omicron cases confirmed in 5 U.S. states America probably won't lead the effort to understand Omicron.
  2. Vaccines: Omicron adds urgency to vaccinating world — Omicron fuels the case for COVID boosters — Moderna loses patent battles tied to COVID vaccine — Pfizer could have vaccine data for children under five by end of 2021, CEO says.
  3. Politics: Nevada to impose insurance surcharge on unvaccinated state workers — New Jersey GOP lawmakers defy statehouse COVID policy — Oklahoma sues Biden administration over Pentagon vaccine mandate — Omicron travel bans are sign of what's to come.
  4. World: WHO: Delta health measures help fight Omicron — COVID cases surge in South Africa in sign Omicron wave is coming — Germany approves new restrictions for unvaccinated people.
  5. Variant tracker: Where different strains are spreading.
Updated 11 hours ago - Politics & Policy

Prosecutors charge parents of Michigan school shooting suspect

Photo: Scott Olson/Getty Images

The parents of a 15-year-old accused of killing four students and wounding seven other people at a Michigan high school have been charged with four counts of involuntary manslaughter, according to court documents.

The latest: Lawyers for James and Jennifer Crumbley told the Detroit News they are "returning to the area to be arraigned," after law enforcement officials announced a search for the Crumbleys had been initiated.