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Photo: Leon Neal/Getty Images

President Trump tweeted biting remarks targeting his former national security advisor John Bolton, claiming without evidence that if he'd listened to Bolton the U.S. "would be in World War Six by now."

"For a guy who couldn't get approved for the Ambassador to the U.N. years ago, couldn’t get approved for anything since, “begged” me for a non Senate approved job, which I gave him despite many saying “Don’t do it, sir,” takes the job, mistakenly says “Libyan Model” on T.V., and many more mistakes of judgement, gets fired because frankly, if I listened to him, we would be in World War Six by now, and goes out and IMMEDIATELY writes a nasty & untrue book. All Classified National Security. Who would do this?"
— President Trump on Twitter

The big picture: Bolton, a member of the GOP's old guard, served as Trump's national security adviser for nearly a year before being ousted. The president's attack comes as Bolton's potential testimony could prove to be hugely consequential for the Senate impeachment trial.

  • Revelations from Bolton's forthcoming book that Trump tied military aid to Ukraine to investigations of potential 2020 rival Joe Biden and his son, Hunter, appear to have swayed more GOP senators in recent days, with some signaling they're more likely to vote for witnesses than before.

Go deeper:

Go deeper

38 mins ago - World

WHO revises air quality guidelines to reduce deaths from pollution

Smoke from California wildfires over the Golden Gate Bridge in San Francisco in August 2021. Photo: David Paul Morris/Bloomberg via Getty Images

The World Health Organization on Wednesday updated air quality guidelines it set roughly 15 years ago, saying that negative health effects from air pollutants can begin at lower levels than it previously thought.

Why it matters: The changes are meant to reduce deaths from pollutants that cause cardiovascular and respiratory diseases and prematurely kill an estimated 7 million people around the world annually, according to the WHO.

Ben Geman, author of Generate
2 hours ago - Energy & Environment

The road to COP26 gets slightly easier

Illustration: Annelise Capossela/Axios

The bad diplomatic vibes heading into the critical United Nations climate summit in Glasgow, Scotland, might be improving slightly.

Catch up fast: Chinese President Xi Jinping yesterday pledged to end overseas finance for building new coal-fired power plants and boost support for clean energy in developing nations.

Corporations turn focus to retaining frontline workers

Illustration: Shoshana Gordon/Axios

Companies are narrowing the blue- and white-collar experience as they're forced to adapt to a worker-led market.

Driving the news: Basic office tools and concepts like corporate communications and schedule flexibility are migrating to frontline operations through investments in technology.