WASHINGTON — It was one of Capitol Hill’s most salacious scandals, featuring a senator’s affair with a campaign aide, an outraged husband, tens of thousands of dollars in hush money, illicit lobbying deals with Las Vegas power brokers and a dramatic intervention by a leading Christian ministry.

Now, three years after the fall of former Senator John E. Ensign of Nevada, thousands of pages of previously undisclosed documents reveal new details about the evidence the F.B.I. gathered against Mr. Ensign, who briefly flirted with running for president in 2012. The documents, which show that Mr. Ensign’s behavior was more brash than known at the time, also offer new specifics about the intense debate within the Justice Department over the decision to not prosecute Mr. Ensign, despite an aggressive F.B.I. investigation into the scandal.

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Further reading:  What CREW Has Learned about the John Ensign Investigation