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Former special counsel Robert Mueller. Photo: Alex Wong/Getty Images

Andrew Weissmann, one of former special counsel Robert Mueller's top prosecutors, says in his new book, "Where Law Ends: Inside the Mueller Investigation," that the probe "could have done more" to take on President Trump, per The Atlantic.

Why it matters ... Weissmann argues that the investigation's report didn't go far enough in making a determination regarding Trump's potential obstruction of justice: "When there is insufficient proof of a crime, in volume one, we say it. But when there is sufficient proof, with obstruction, we don’t say it. Who is going to be fooled by that? It’s so obvious."

  • "Had we given it our all—had we used all available tools to uncover the truth, undeterred by the onslaught of the president’s unique powers to undermine our efforts?" Weissmann asks in the book's introduction.
  • "Part of the reason the president and his enablers were able to spin the report was that we had left the playing field open for them to do so."

Flashback: In its report, Mueller's team compiled 10 different episodes where Trump may have potentially committed obstruction of justice.

  • The document's final words: "Accordingly, while this report does not conclude that the President committed a crime, it also does not exonerate him."
  • That allowed Attorney General Bill Barr to say that the Department of Justice had concluded that the evidence was "not sufficient to establish that the President committed an obstruction-of-justice offense," noting that the government would have to prove such a case "beyond a reasonable doubt."

The bottom line: Weissmann told The Atlantic that Mueller "absolutely" let the American people down — before hedging that "the office" had done so — and agreed that the investigation had been "a historic missed opportunity."

Go deeper: 7 takeaways from the Mueller report

Go deeper

Attorney General Barr departs Justice Department

Photo: Michael Reynolds/Pool/AFP via Getty Images

Attorney General Bill Barr sent a parting note to his colleagues on Wednesday to mark the end of his time leading the Department of Justice, stating that it's been a "great honor to serve once again in this role," NBC News reports.

What to watch: Barr will be replaced in an acting capacity by Deputy Attorney General Jeffrey Rosen, who multiple administration officials privately say now has the worst job in Washington.

Thousands without power as "hazardous" winter storm lashes East Coast

Winter view from Charlotte as winter storm Izzy creates dangerous conditions in Charlotte, N.C. on Jan. 16. Photo: Peter Zay/Anadolu Agency via Getty Images

A major winter storm was lashing much of the East Coast on Sunday, causing widespread power outages and disrupting travel over the holiday weekend.

The big picture: Heavy snow and ice accumulations are "likely to produce hazardous travel," downed trees and more power outages from the Mid-South to the Northeast, per the National Weather Service. Some parts of the U.S. can expect to see up to a foot of snow through Monday.

Updated 4 hours ago - Science

Volcanic eruption in Tonga caused "significant" damage

This satellite image of the eruption on Jan. 15 taken by Himawari-8, a Japanese weather satellite operated by Japan Meteorological Agency and released by National Institute of Information and Communications Technology (NICT). Photo: NICT via AP

Significant damage has been reported in Tonga following an undersea volcanic eruption on Saturday, which covered the Pacific nation in ash and cut off communication lines.

Driving the news: The eruption triggered tsunami warnings across Tonga's islands and in other regions, including the West Coast of the U.S. and New Zealand.