Sen. Robert Menendez, D-N.J., is using obscure tariff waivers in the nation’s capital to aid large chemical and pharmaceutical manufacturers with high-dollar political muscle back home.

A member of the Senate Finance Committee, Menendez has introduced 118 bills to exempt specific products from normal import duties. That is almost twice as many as anyone else on the committee, which controls the fate of what are known as “Miscellaneous Tariff Bills” or MTBs.