WASHINGTON — Far-right influencers have been hinting in recent weeks that they have finally found a venue — Miami — and a federal prosecutor — Jason A. Reding Quiñones — to pursue long-promised charges of a “grand conspiracy” against President Donald Trump’s adversaries.

Their theory of the case, still unsupported by the evidence: A cabal of Democrats and “deep-state” operatives, possibly led by former President Barack Obama, has worked to destroy Trump in a yearslong plot spanning the inquiry into his 2016 campaign to the charges he faced after leaving office.

But that narrative, which has been promoted in general terms by Trump and taken root online, has emerged in a nascent but widening federal investigation.

Last week, Reding Quiñones, the Trump-appointed U.S. attorney for the South

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