Menendez was accused of accepting gifts and contributions to his campaign from Melgen in exchange for his political influence.

However, in contrast to his first federal corruption trial, Menendez's support among the state's Democratic elite waned on Friday.

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Menendez, 69, has maintained his political relevance for almost 50 years.

Additionally, Menendez is charged with attempting to sabotage the prosecution of one of the businessmen by lobbying for the appointment of Philip R. Sellinger to the position of U.S. attorney for New Jersey because he believed he could exert influence on Sellinger.

Authorities discovered $480,000 in cash in Menendez's home, much of it stashed in closets, clothing, and a safe, along with more than $100,000 worth of gold bars, according to the prosecution.

Nadine Menendez "denies any criminal conduct," according to her attorney David Schertler, and "will vigorously contest these charges in court."

Menendez appears to be the first sitting senator in U.S. history to have been indicted on two unrelated criminal matters, according to the Senate Historical Office.

He faces reelection next year in a bid to extend his three-decade career in Washington as Democrats hold a narrow majority in the Senate.