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Top Mueller prosecutor: 'We could have done more' in Russia investigation

A top prosecutor in former special counsel Robert MuellerRobert (Bob) MuellerCNN's Toobin warns McCabe is in 'perilous condition' with emboldened Trump CNN anchor rips Trump over Stone while evoking Clinton-Lynch tarmac meeting The Hill's 12:30 Report: New Hampshire fallout MORE's investigation of President TrumpDonald John TrumpVenezuela judge orders prison time for 6 American oil executives Trump says he'll leave White House if Biden declared winner of Electoral College The Memo: Biden faces tough road on pledge to heal nation MORE's campaign and Russia is planning a new book that examines what he calls a "hard truth" about the probe; namely, that it was not as successful as it could have been.

Andrew Weissman, the former head of the Justice Department's criminal fraud division, said he plans to release a memoir on Sept. 29 that details the Mueller team's efforts to investigate figures close to the Trump campaign and its battles with the White House, according to The Associated Press.

"I am deeply proud of the work we did and of the unprecedented number of people we indicted and convicted — and in record speed. But the hard truth is that we made mistakes. We could have done more. ‘Where Law Ends’ documents the choices we made, good and bad, for all to see and judge and learn from," Weissman told the news service.

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"This is the story of our investigation into how our democracy was attacked by Russia and how those who condoned and ignored that assault undermined our ability to uncover the truth," he continued. "My obligation as a prosecutor was to follow the facts where they led, using all available tools and undeterred by the onslaught of the president’s unique powers to undermine our work."

Mueller's probe, which dominated much of the conversation in Washington, D.C.'s political sphere, concluded last year and largely receded from the headlines. The investigation, which ended with charges filed against members of the Trump campaign, including Paul ManafortPaul John ManafortOn The Money: Initial jobless claims rise for 2nd week | Dow dips below 30K | Mnuchin draws fire for COVID-19 relief move | Manhattan DA appeals dismissal of Manafort charges Manhattan DA appeals dismissal of Manafort charges to NY high court How to combat Putin's financial aggression MORE and Richard Gates, did not take a position on whether the president had obstructed justice. 

Democrats argued that the probe and the president's conversations with Ukraine's president, in particular, revealed intent to seek foreign assistance in the 2020 election and sought his removal from office. The House impeachment effort ended with Trump's acquittal in a trial in the GOP-controlled Senate in which all members of the Democratic Caucus and one Republican, Sen. Mitt RomneyWillard (Mitt) Mitt RomneyBiden teams to meet with Trump administration agencies Paul Ryan calls for Trump to accept results: 'The election is over' Trump transition order follows chorus of GOP criticism MORE (Utah), voted to remove the president from office. 

--This report was updated at 9:53 a.m.