Democratic Reps. Andy Kim, D-N.J., and Adam Schiff, D-Calif., are scheduled to be sworn-in as U.S. senators on Monday after their placeholders George Helmy and Laphonza Butler resigned last week. 

Schiff won the seat of longtime Democratic Sen. Dianne Feinstein, who died last year. Kim won the seat that was vacated by former Sen. Bob Menendez, D-N.J. He resigned after he was convicted on federal bribery charges. 

Their first formal vote in the Senate is expected to be on the confirmation of four district judges, according to Politico.

The new Congress convenes on Jan. 3.