Affiliation |
Senators |
Notes |
| Republican Party |
55 |
|
| Democrat Party |
44 |
|
| Independent |
2 |
Caucuses with Democrats |
Total |
100 |
|
|
| |
Leadership |
Office |
Officer |
Party |
State |
Since |
| President |
Dick Cheney |
Republican |
Wyoming |
2001 |
| President Pro Tempore |
Ted Stevens |
Republican |
Alaska |
2003 |
| President Pro Tempore Emeritus |
Robert Byrd |
Democrat |
West Virginia |
2003 |
|
| |
Majority leadership |
Office |
Officer |
Party |
State |
Since |
| Senate Majority Leader |
Bill FristRETIRING |
Republican |
Tennessee |
2003 |
| Senate Majority Whip |
Mitch McConnell |
Republican |
Kentucky |
2003 |
| Republican Conference Chairman |
Rick Santorum |
Republican |
Pennsylvania |
2001 |
| Republican Policy Committee Chairman |
Jon Kyl |
Republican |
Arizona |
2003 |
| Republican Conference Vice Chairman |
Kay Bailey Hutchison |
Republican |
Texas |
2001 |
| Republican Campaign Committee Chairman |
Elizabeth Dole |
Republican |
North Carolina |
2005 |
|