Sen. Bob Menendez (D-NJ) pleaded not guilty in federal court on Monday to conspiring to act as a foreign agent on behalf of the Egyptian government, the second time in as many months Menendez has had to enter a plea in response to corruption-related charges.

Menendez's appearance in court came as a result of U.S. District Attorney Damian Williams bringing a second indictment against the senator this month over allegations he violated the Foreign Agents Registration Act while he was serving as the head of the Senate Foreign Relations Committee.

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Menendez and his wife Nadine were initially hit with three charges in September for allegedly engaging in a corrupt relationship with three businessmen, Wael Hana, Jose Uribe, and Fred Daibes.

The couple allegedly accepted bribes that included hundreds of thousands of dollars in cash, gold bars, a luxury vehicle, and more, according to the indictment.

All five already pleaded not guilty to the initial charges. Bob and Nadine Menendez and Hana were all charged with conspiracy for a public official to act as a foreign agent in the updated indictment. Nadine Menendez and Hana pleaded guilty to that charge last week.

Menendez said in a statement when he was charged with the FARA violation that he has been "loyal to only one country — the United States of America."

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"Piling new charge upon new charge does not make the allegation true. ... It is an attempt to wear someone down and I will not succumb to this tactic," Menendez said.

This story is developing.