In the United States Senate, the selection of Committee Chairs and committee appointments are made by:

The Senate President
The Speaker
The Majority Leader

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In the United States Senate, the selection of Committee Chairs and committee appointments are made by the Majority Leader.

To explain further, the Majority Leader is a leadership position within the Senate that is held by the senator from the majority party (the political party with the most members in the Senate). The Majority Leader has significant authority and influence in shaping the Senate's agenda, managing legislative priorities, and making key decisions about committee assignments.

When it comes to committee appointments, the Majority Leader plays a crucial role in determining which senators are assigned to specific committees and who becomes the Chair of each committee. Committee Chairs have the power to set the agenda, schedule hearings, and oversee the legislative process within their respective committees.

The Speaker, on the other hand, is a position in the House of Representatives, not the Senate. The Speaker of the House has authority over committee appointments and assignments in the House Chamber. Similarly, the Senate President, who is the Vice President of the United States, does not have direct involvement in committee appointments in the Senate.