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Photo: Oliver Contreras/For The Washington Post via Getty Images

The White House says that former national security adviser John Bolton's book contains top secret information in a letter addressed to his attorney that was publicly released Wednesday.

The state of play: The development, first reported by CNN's Jake Tapper, sets up a potential legal battle between Bolton and the White House over the book's publication, which is currently scheduled for March 17.

  • The letter, dated Jan. 23, claims the book contains "significant amounts of classified information" that could "cause exceptionally grave harm" to U.S. national security.
  • It was signed by Ellen Knight, the National Security Council's senior director for records, access and information security management.
  • The letter says, "the manuscript may not be published or otherwise disclosed without the deletion of this classified information" and that the White House will be in touch with "additional, more detailed guidance regarding next steps" on how to move forward.

The big picture: It comes amid an ongoing battle over whether to call Bolton as a witness in President Trump's Senate impeachment trial after the manuscript's account of the Ukraine saga leaked to the New York Times.

  • Trump chimed in regarding Bolton on Twitter Wednesday, saying the U.S. "would be in World War Six by now" if he had listened to his former national security head during his tenure.
  • The president also foreshadowed this decision about Bolton's "nasty & untrue" book, which was submitted last month to the White House for pre-publication review, claiming it contained "All Classified National Security."

Go deeper:

Go deeper

Gaming CEO calls on industry to help fight climate change

"Catalyst Black." Screenshot: Super Evil Megacorp

Gaming CEO Kristian Segerstrale is calling on leaders in his industry to take action on climate change, after completing a $1.4 million fundraising campaign this summer.

Why it matters: Gaming's pandemic-fueled boom creates an opportunity, and maybe even an obligation, to do some good.

3 hours ago - World

U.S. releases updated vaccination, testing rules for foreign travelers

Photo: Patrick T. Fallon/AFP via Getty Images

Foreign travelers will be allowed entry to the U.S. beginning Nov. 8 if they can provide proof of full COVID-19 vaccination with a shot authorized by the World Health Organization and a negative test within three days of departure, the White House announced Monday.

Why it matters: The updated guidance, which exempts children under the age of 18 from the vaccine requirement, is intended to provide further clarity for airlines and foreign nationals who have been restricted from traveling to the U.S. since early 2020.

4 hours ago - Sports

Unvaccinated athletes face 21-day quarantine at Beijing Olympics

Logos for the 2022 Winter Olympics at Yanqing Ice Festival in February 2021 in Beijing. Photo: Lintao Zhang/Getty Images)

Athletes, staff members and journalists at the 2022 Beijing Olympic and Paralympic Winter Games who have not been vaccinated against the coronavirus will be required to quarantine for three weeks, the International Olympic Committee (IOC) outlined in its newly-published "playbooks."

Why it matters: The quarantine period is longer than the Games themselves, meaning vaccinations or an earlier arrival date will be required to participate in or cover the Games.