"There is a colloquial legal term for McCarthy’s approach: It’s a fishing expedition" is a line from in David French's opinion column "Where's the evidence, Speaker McCarthy" in the New York Times (subscription).
I discovered dynamite fishing is a "thing" which you can read about if you look up "blast fishing" on Wikipedia. This is really the approach the House GOP is taking.
From Wiki: Blast fishing, fish bombing, dynamite fishing or grenade fishing is a destructive fishing practice using explosives to stun or kill schools of fish for easy collection. This often illegal practice is extremely destructive to the surrounding ecosystem, as the explosion often destroys the underlying habitat (such as coral reefs) that supports the fish. The frequently improvised nature of the explosives used, and undetonated charges, means danger for fishermen and divers as well, with accidents and injuries.
Fishing expidition meaning is an open-ended inquiry or investigation, often undertaken on the pretext of a minor or unrelated matter, whose real purpose is to uncover embarrassing or damaging information, as about a political opponent. Reference.
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