President Trump and John Bolton. Photo: Jabin Botsford/The Washington Post via Getty Images

The lawyer for former national security adviser John Bolton responded on Wednesday to the White House's claim that a manuscript of Bolton's forthcoming book contains top-secret information.

What they're saying: Charles Cooper wrote in a letter, "We do not believe that any of that information could reasonably be considered classified, but given that Ambassador Bolton could be called to testify as early as next week, it is imperative that we have the results of your review of that chapter as soon as possible. Please do give me a call to let me know how we can work together toward that end."

Catch up quick: The White House made public on Wednesday a Jan. 23 letter addressed to Cooper. The letter claimed that Bolton's manuscript contains "significant amounts of classified information" that could "cause exceptionally grave harm" to U.S. national security.

  • The White House's letter was signed by Ellen Knight, the National Security Council's senior director for records, access and information security management.
  • A leak of Bolton's manuscript has already caused shockwaves in the impeachment trial against President Trump. The book explicitly alleges that Trump directly tied Ukrainian aid to investigations of Democrats Joe and Hunter Biden. Joe Biden is a leading candidate for his party's presidential nomination.

What to watch: The Senate will vote Friday on whether to call witnesses in the impeachment trial, potentially including Bolton.

Read Cooper's letter here:

Go deeper: Live updates: Senators get their turn for questions

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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.

Biden is highest-spending political candidate on TV ads

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After spending an additional $45.2 million on political ads this week, former Vice President Joe Biden has become the highest-spending political candidate on TV ads ever, according to data from Advertising Analytics.

By the numbers: In total, the Biden campaign has spent $582.7 million on TV ads between 2019 and 2020, officially surpassing Michael Bloomberg's record spend of roughly $582 million. Biden's spend includes his primary and general election advertising.