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Biden ordered an independent review of how the gunman could have come so close to killing or severely wounding Trump despite the heavy security.
The criminal case, brought by the US Department of Justice, amounts to another legal setback for Trump as he seeks to regain the US presidency next year
The documents spanned Biden's time in the Senate and the vice presidency, while the notes dated to his time as vice president.
The action has taken place in coordination with the Interpol, FBI, Royal Canadian Mounted Police and Australian Federal Police.
Police had yet to identify the dead man and during a pair of news briefings declined to comment on his motive.
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