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Donald Trump assassination conspiracy theorists may not believe it, but Thomas Matthew Crooks worked alone when he tried to kill the prez -- this according to the FBI.

Fox News conducted an interview with FBI Director Kash Patel , FBI Deputy Director Dan Bongino , and an unnamed senior involved in the Butler shooting investigation ... and the three told the outlet the assassination wasn't part of a great cover-up. Getty

Bognino told Fox, "We have reviewed this case over and over -- looked into every nugget. We have spoken to the families, the president -- there is no cover-up here. There is no motive for it, there is no reason for it."

Director Patel said President Trump has been thoroughly briefed on the investigation as well ... and he is "satisfied with

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