By Luc Cohen

NEW YORK U.S. Senator Bob Menendez is set to enter a plea on Monday to a new indictment charging him with conspiring to act as an unregistered foreign agent for the Egyptian government.

Federal prosecutors on Oct. 12 accused the New Jersey Democrat - until recently the chair of the Senate Foreign Relations Committee - of taking actions from 2018 to 2022 on behalf of Egyptian military and intelligence officials.

Menendez is expected to be asked to enter a plea to the new charge at the 3 p.m. EDT (1900 GMT) arraignment before U.S. District Judge Sidney Stein. His lawyers did not respond to a request for comment.

In an Oct. 12 statement, Menendez said "piling new charge upon new charge does not make the allegations true."

The senator and his wife Nadine Menendez had previously been charged with accepting hundreds of thousands of dollars worth of cash and gold bars from three New Jersey businessmen in exchange for using his influence to benefit Egypt's government and interfere with law enforcement probes into the businessmen.

All defendants on Sept. 27 pleaded not guilty to those charges. Nadine Menendez and one of the businessmen, Wael Hana, pleaded not guilty to the foreign agent charge on Oct. 18.

Under the Foreign Agents Registration Act, individuals must register with the department if they act as "an agent of a foreign principle."

Prosecutors said Hana arranged meetings between the senator and Egyptian officials, who pressed him to sign off on military aid. In return, the businessman put Nadine Menendez on the payroll of a company he controlled, prosecutors said.

The new indictment said both Hana and Nadine Menendez communicated requests and directives from Egyptian officials to the senator.

Bob Menendez has resisted calls from fellow Democrats to resign.

(Reporting by Luc Cohen in New York; Editing by Noeleen Walder and Jonathan Oatis)