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Photo illustration: Jaap Arriens/NurPhoto/Getty Images

President Trump set a personal record last month by tweeting or retweeting nearly 800 times, almost 100 posts beyond what he published in any previous month of his presidency, according to a USA Today analysis.

Why it matters: Trump sent his September slew of tweets amid a rapidly unfurling impeachment inquiry, which also came as he targeted 2020 Democrats in preparation for his reelection bid. He has faced backlash from political competitors and some allies as a result of his tweets.

By the numbers:

  • Trump published his own words on Twitter 500 times last month, twice his average monthly frequency in 2018.
  • Trump used the word "treason" 5 times and the word "Ukraine" more than 40 times out of 320 since the story broke about his July phone call with Ukraine's president Volodymyr Zelensky,
  • Trump raised the name of Biden or his son, Hunter, more than 20 times.
  • He also wrote "Schiff" 22 times in reference to House Intelligence Chairman Adam Schiff (D-Calif.), whose committee is investigating the phone call with Zelensky as part of an impeachment inquiry.

The big picture: No other administration has used Twitter like Trump has, and social media platforms are struggling to cope with the reality of becoming political battlegrounds as the 2020 elections ramp up.

Go deeper: Kamala Harris asks Twitter CEO Jack Dorsey to suspend Trump's account

Go deeper

Inside Biden's Taiwan flubs

Illustration: Aïda Amer/Axios

Twice this year, President Biden has blurted out commitments that the U.S. is prepared to defend Taiwan against a Chinese invasion — forcing the White House to walk back his statements and leading to confusion over a high-stakes national security policy.

Why it matters: U.S. defense officials have publicly aired their concerns that China will take Taiwan by force in the next four to six years, perhaps sooner. The president's position on this question may soon have real-world, life and death consequences.

"Atmospheric river" to whiplash Northern California from drought to flood

A map depicting 24-hour preciptation forecast (inches) ending Monday at 5a.m. local time. Photo: NOAA

A series of powerful "atmospheric river" storms are set dump historic amounts of rainfall across parts of drought-stricken California and the Pacific Northwest from this weekend, forecasters warn.

Why it matters: A strong atmospheric river, packing large amounts of moisture, is predicted to whiplash Northern California from drought to flood.

10,000 trees near giant sequoia groves to be removed after fires

A firefighter looks up at a giant sequoia tree after fire burned through the Sequoia National Forest near California Hot Springs, California, on Sept. 23. Photo: Patrick T. Fallon/AFP via Getty Images

"Upwards of" 10,000 trees near giant sequoia groves have been "weakened by drought, disease, age, and/or fire" and must be removed in the wake of California's wildfires, the Sequoia and Kings Canyon National Parks announced.

Why it matters: The damage to these trees, considered "national treasures," and work to remove them means a nearby key highway must remain closed to visitors as they have "the potential to strike people, cars, other structures, or create barriers to emergency response services," per a statement from the national parks.