Blumenthal (D-CT)*
Durbin (D-IL)
Grassley (R-IA)*
Feinstein (D-CA)
Cornyn (R-TX)
Whitehouse (D-RI)
Hawley (R-MO)
Hirono (D-HI)
Kennedy (D-LA)*
Casey (D-PA)
Blackburn (R-TN)
Masto (D-NV)*
Collins (R-ME)
Hassan (D-NH)*
Ernst (R-IA)
Warner (D-VA)
Hyde-Smith (R-MI)
Murkowski (R-AK)*
Portman (R-OH)*
* are up for re-election this year.
Bit of a pain to find this information really - couldn't find a single news outlet with a list of who introduced the bill. Kinda seems like they don't want to be known.