Bob Menendez
Sherrod Brown and Peter Welch became the second and third Democratic senators to urge Menendez to step down as he faces bribery charges.
Fetterman said Menendez "cannot continue to wield influence over national policy, especially given the serious and specific nature of the allegations."
The New Jersey Democrat's silence about the allegations against his colleague stand out among calls for Menendez to step down.
The embattled senator refused to resign and declared he will prevail and "continue to be the senior senator from New Jersey."
WHAT'S HAPPENING
The New York congresswoman joins the ranks of numerous other Democrats calling for his resignation after a bombshell corruption indictment.
The Republican presidential candidate said he has "no interest" in becoming a senator, days after Menendez was accused of taking bribes from businessmen.
The third-term congressman may not be the only Democrat to enter the race.
The sweeping bribery case brought against U.S. Sen. Bob Menendez includes allegations that he took cash and gold in exchange for interfering in a criminal case against a New Jersey real estate developer.
The Democratic senator and his wife were indicted after allegedly accepting bribes from an Egyptian American businessman.
The New Jersey senator "has rightly decided" to temporarily give up the committee gavel amid corruption charges, said Majority Leader Chuck Schumer.