Sen. George Helmy, a Democrat and former chief of staff to New Jersey Gov. Phil Murphy, was sworn in on Monday and will serve in office for about two months until the November election. Democratic Rep. Andy Kim and Republican hotelier Curtis Bashaw are vying for the seat in November and the winner will immediately replace Helmy.

The resignation of Sen. Bob Menendez​ is scheduled to go into effect Tuesday. A jury convicted him on federal bribery charges​ last month.