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Former White House national security adviser John Bolton met privately with President Trump in August in an effort to convince him to release nearly $400 million in frozen military aid to Ukraine, former National Security Council official Tim Morrison told impeachment investigators last month.

Why it matters: The episode underscores how important Bolton's testimony could ultimately be to determining why Trump withheld security assistance to Ukraine at a time when he was pushing its government to investigate his political rivals — a question at the heart of the impeachment inquiry.

  • Morrison testified that Bolton emerged from the meeting and simply said that Trump was "not yet ready" to release the money.
  • Bolton also warned Morrison not to get involved with EU Ambassador Gordon Sondland — who communicated to Ukrainian officials that the aid would be released if they announced investigations into Joe Biden and the 2016 election — and to "make sure the lawyers are tracking."

The big picture: Bolton failed to appear for his closed-door deposition earlier this month and told the House committees conducting the impeachment inquiry that he would challenge a potential subpoena for his testimony in court.

  • A House Intelligence Committee official responded that Democrats have "no interest in allowing the administration to play a rope-a-dope with us in the courts for months," and that the White House's decision to block Bolton from testifying will be used as further evidence of obstruction for a potential article of impeachment.

What to watch: While Democrats likely believe they have enough evidence from existing testimonies to vote on impeachment, Bolton remains the inquiry's biggest wildcard. Sources told Axios' Jonathan Swan that Bolton was the most prolific note-taker at the top level of the White House and probably has more details than any witness about Trump's machinations on Ukraine.

Go deeper: Trump aides fear Bolton's secret notes

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Biden: The next president should decide on Ginsburg’s replacement

Joe Biden. Photo: Drew Angerer / Getty Images

Joe Biden is calling for the winner of November's presidential election to select Ruth Bader Ginsburg's replacement on the Supreme Court.

What he's saying: "[L]et me be clear: The voters should pick the president and the president should pick the justice for the Senate to consider," Biden said. "This was the position the Republican Senate took in 2016 when there were almost 10 months to go before the election. That's the position the United States Senate must take today, and the election's only 46 days off.

Trump, McConnell to move fast to replace Ginsburg

Photo: Alex Wong/Getty Images

President Trump will move within days to nominate his third Supreme Court justice in just three-plus short years — and shape the court for literally decades to come, top Republican sources tell Axios.

Driving the news: Senate Majority Leader Mitch McConnell and Senate Republicans are ready to move to confirm Trump's nominee before Election Day, just 46 days away, setting up one of the most consequential periods of our lifetimes, the sources say.

Updated 8 hours ago - Politics & Policy

Coronavirus dashboard

Illustration: Sarah Grillo/Axios

  1. Global: Total confirmed cases as of 10 p.m. ET: 30,393,591 — Total deaths: 950,344— Total recoveries: 20,679,272Map.
  2. U.S.: Total confirmed cases as of 10 p.m. ET: 6,722,699 — Total deaths: 198,484 — Total recoveries: 2,556,465 — Total tests: 92,163,649Map.
  3. Politics: In reversal, CDC again recommends coronavirus testing for asymptomatic people.
  4. Health: Massive USPS face mask operation called off The risks of moving too fast on a vaccine.
  5. Business: Unemployment drop-off reverses course 1 million mortgage-holders fall through safety netHow the pandemic has deepened Boeing's 737 MAX crunch.
  6. Education: At least 42% of school employees are vulnerable.