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Illustration: Sarah Grillo/Axios

John Bolton is the impeachment inquiry's biggest wildcard. People around the president say they are worried about what notes Trump's former national security adviser has kept and when he might divulge them.

Why it matters: These sources, including both current and former senior administration officials, tell me that the former national security adviser was the most prolific note-taker at the top level of the White House and probably has more details than any impeachment inquiry witness, so far, about President Trump's machinations on Ukraine.

  • "Bolton was a voracious note-taker, in every meeting," said a source who attended numerous meetings with him.
  • While others sat and listened in meetings with Trump, Bolton distinguished himself by filling legal pads with contemporaneous notes on what was said in the room.

The intrigue: Bolton's lawyer, Chuck Cooper, caught the attention of impeachment investigators and administration officials on Friday with a provocative line he dangled in a letter to the House's general counsel: that Bolton "was personally involved" in "many relevant meetings and conversations that have not yet been discussed" in the impeachment testimonies.

Behind the scenes: This tease from Bolton's lawyer provoked this warning from a senior administration official:

  • "Typically, anything that could contain classified information is turned over to the White House for review when an employee departs. … One would hope Bolton has considered that before advertising that he has additional information."
  • "It could be that these are notes that the White House has already viewed," the official added. "But if not, it would mean Bolton deliberately concealed them during his offboarding, which could lead to legal repercussions depending on the contents."

To be clear, there is no evidence that Bolton has held onto classified information. But the unease inside the administration has been churning ever since staff learned that Bolton had signed a book deal to tell about his time working for Trump. Bolton's book deal is worth $2 million, per AP, which suggests he's willing to dish.

Between the lines: Unlike most of the impeachment witnesses so far, Bolton talked one-on-one with the president on numerous occasions. He has a degree of insight that the impeachment witnesses we've seen so far simply cannot offer.

  • Bolton and his former deputy Charlie Kupperman — both represented by Cooper — have asked a court to determine whether they should obey the White House's order not to testify or the House Democrats' request for their testimony.

The bottom line: All of this may come to nothing because House Democrats are rushing to vote on impeachment before the end of the year. Democrats have said they don't want to get sucked into a lengthy legal battle, and so they have not subpoenaed Bolton to testify. The courts, however, have shown they're willing to move faster than normal if Democrats were willing to delay their timeline and chase Bolton.

  • If House Democrats maintain their current stance — and there's every sign they will — it's a relief for administration officials who have been nervously contemplating what Bolton knows and what he's recorded in that mountain of legal pads.
  • Even if Bolton doesn't testify, he could still put out information before the election that’s deeply damaging to Trump.

The big picture: Unlike current administration officials who may be motivated not to testify by their loyalty to President Trump, it seems more likely, based on Bolton's background, that he genuinely wanted the courts to resolve whether Congress or the White House has the power to compel or stop him from testifying.

  • Bolton and Cooper worked together in the Reagan administration's Justice Department. They have spent decades contemplating questions about the separation of powers.
  • And if Bolton plans to spend his post White House life professing his devotion to Trump, he's doing a good job hiding it. Since resigning, he has publicly criticized Trump's North Korea policy and has enlisted James Comey's book agents to help him do the thing Trump hates most: write an insider account of his time in the White House.

Go deeper: Bolton signs $2 million book deal

Go deeper

Updated 3 hours ago - Sports

Olympics dashboard

Katie Ledecky in Tokyo. Photo: Ding Xu/Xinhua via Getty Images

🚨: Simone Biles won't compete in individual vault or uneven bars

🏊‍♀️: Katie Ledecky wins gold in women's 800m freestyle

🏊: Caeleb Dressel breaks world record in men's 100m butterfly, 3rd gold

🇬🇧: Britain wins gold in first-ever Olympic mixed 4x100m medley relay

🎾: Novak Djokovic defeated in Olympic semi-finals

💻: Japan tests teleporting games and "remote cheering"

Go deeper: Full Axios coverage

Updated 4 hours ago - Sports

Simone Biles won't compete in individual vault or uneven bars Olympic finals

Photo: Loic Venance/AFP via Getty Images

Simone Biles will not compete in the individual vault or uneven bars finals at the Tokyo Olympics, USA Gymnastics announced Friday.

Why it matters: USA Gymnastics said Biles, who previously withdrew from the individual all-around and team finals to prioritize her mental health, will continue to be evaluated to determine if she'll compete in the balance beam or floor exercise events.

4 hours ago - Sports

American Katie Ledecky wins Olympic gold in women's 800m freestyle

USA's Katie Ledecky reacts after taking gold in the final of the women's 800m freestyle race. Photo: Odd Anderson/AFP via Getty Images

American superstar swimmer Katie Ledecky grabbed her second gold medal of this year's Olympic Games, winning the women's 800-meter freestyle race Saturday in Tokyo.

Driving the news: Ledecky, who holds the world record in the 800m freestyle, is considered one of the best women swimmers of all time. Saturday's final marks her third straight Olympic gold in the event.