Sen. Bob Menendez, a Democrat who’s on trial on federal bribery charges, filed Monday to seek reelection in New Jersey as an independent. His petition needed 800 signatures to put him on the ballot, CBS News reports; the state’s elections website shows he submitted almost 2,500. The incumbent had already said he wouldn’t run again as a Democrat. Members of his party, including Illinois Sen. Dick Durbin on Monday, have raised concerns about whether a third-party or independent run by Menendez would hurt their chances of holding onto the seat. Many party leaders have called on him to resign. Rep…