Three years ago, Gregorio Kilili Sablan authored similar legislation that he modeled after a CNMI law that made it illegal to possess, sell, or distribute shark fins in the islands.
Twelve US states and two other territories have also banned shark finning or the sale of fins.
Mr Sablan said stripping fins from sharks and throwing the animals back in the water to drown or bleed to death has contributed to the rapid decline of shark populations worldwide.
Closing the commercial market for shark fins in the US should help end this wasteful and destructive practice, he said.
The legislation has bipartisan support and the backing of major environmental groups.
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