Eric Trump 's unhappy with the investigation into the attempt on his father's life ... and, he seems to be indicating there's widespread conspiracy surrounding it.

The son of President Donald Trump made an appearance on CNN Sunday to promote his new book "Under Siege: My Family's Fight to Save Our Nation" ... and, he was asked about a recent comment he made saying he was "unsatisfied" with all the questions surrounding the July 2024 attack in Butler, Pennsylvania. Getty

Trump launches into an angry tirade ... telling the host he's absolutely pissed that it doesn't seem the public knows anything about the man who shot Trump , Thomas Matthew Crooks .

Eric then seems to point to a conspiracy ... saying, "I think they did everything they could to take my father off that s

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