Federal prosecutors filed new charges Thursday against Sen. Bob Menendez, D-N.J., accusing him of violating a prohibition on members of Congress from acting as an agent of a foreign principal.

The superseding indictment said Menendez "made multiple requests for the U.S. Department of Justice to commence an investigation against another person for allegedly failing to register under FARA."

Menendez faced a sweeping indictment in late September accusing him and his wife of accepting hundreds of thousands of dollars of bribes in exchange for using the senator's power and influence to seek to protect and enrich the businessman.

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