Who has the power to expel senators from this office?

The power to expel senators lies with the Senate itself. According to the U.S. Constitution, each house of Congress can determine its own rules and has the authority to expel a member by a two-thirds vote. This means that a significant majority of the Senate must agree to expel a senator for it to take place. The process is typically initiated through a resolution and can be influenced by ethical violations or misconduct.