Mexico's Secretary of Foreign Affairs Luis Videgaray Caso (Marco Ugarte / AP)

Mexico's Ministry of Foreign Affairs said it "will not negotiate NAFTA ... through social media or any other news platform." The statement came in response to President Trump's Sunday morning tweets, which called Mexico "one of the highest crime nations in the world" and said the U.S. "may have to terminate" NAFTA.

  • Why it matters: Trump has called his Twitter presence "modern day presidential," but tweets can't replace diplomatic negotiations.
  • On violence in Mexico: "It is a shared problem that will only end if its root causes are addressed: high demand for drugs in the United States and supply from Mexico (and other countries)," the foreign ministry wrote.
  • On the border wall: "Our country will not pay, under any circumstances, for a wall," it continued.

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Post-debate poll finds Biden strong on every major issue

Joe Biden speaks Friday about "The Biden Plan to Beat COVID-19," at The Queen theater in Wilmington, Del. Photo: Drew Angerer/Getty Images

This is one of the bigger signs of trouble for President Trump that we've seen in a poll: Of the final debate's seven topics, Joe Biden won or tied on all seven when viewers in a massive Axios-SurveyMonkey sample were asked who they trusted more to handle the issue.

Why it matters: In a time of unprecedented colliding crises for the nation, the polling considered Biden to be vastly more competent.

Bryan Walsh, author of Future
3 hours ago - Science

The murder hornets are here

A braver man than me holds a speciment of the Asian giant hornet. Photo: Karen Ducey/Getty Images

Entomologists in Washington state on Thursday discovered the first Asian giant hornet nest in the U.S.

Why it matters: You may know this insect species by its nom de guerre: "the murder hornet." While the threat they pose to humans has been overstated, the invading hornets could decimate local honeybee populations if they establish themselves.