Newly appointed acting U.S. Attorney Lindsey Halligan presented the case to secure the indictment of former FBI Director James Comey on her own, according to a source familiar with the grand jury proceedings in Alexandria, Virginia, on Thursday. Tapped for the acting role just three days earlier, Halligan's action came after a senior Justice Department official told NBC News that career prosecutors in Halligan's office sent her a memo documenting why they believed probable cause did not exist to secure an indictment against Comey.

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