- Mike Rounds Senator from SD, Republican
- Marco Rubio Senator from FL, Republican
- Bernard Sanders Senator from VT, Independent
- Ben Sasse Senator from NE, Republican
- Brian Schatz Senator from HI, Democratic
- Adam B. Schiff Senator from CA, Democratic
- Eric Schmitt Senator from MO, Republican
- Charles E. Schumer Senator from NY, Democratic
- Rick Scott Senator from FL, Republican
- Tim Scott Senator from SC, Republican
- Jeanne Shaheen Senator from NH, Democratic
- Kyrsten Sinema Senator from AZ, Independent
- Elissa Slotkin Senator from MI, Democratic
- Tina Smith Senator from MN, Democratic
- Debbie Stabenow Senator from MI, Democratic
- Dan Sullivan Senator from AK, Republican
- Jon Tester Senator from MT, Democratic
- John Thune Senator from SD, Republican
- Thomas Tillis Senator from NC, Republican
- Tommy Tuberville Senator from AL, Republican