Found this old article that points to where in the Constitution...
Expulsion, Censure, Reprimand, and Fine: Legislative Discipline in the House of Representatives April 16, 2002 – June 27, 2016 RL31382
https://www.everycrsreport.com/reports/RL31382.html
The House of Representatives—in the same manner as the United States Senate—is expressly authorized within the United States Constitution (Article I, Section 5, clause 2) to discipline or “punish” its own Members. This authority of the House to discipline a Member for “disorderly Behaviour” is in addition to any criminal or civil liability that a Member of the House may incur for particular misconduct, and is used not merely to punish an individual Member, but to protect the institutional integrity of the House of Representatives, its proceedings, and its reputation.
The House may discipline its Members without the necessity of Senate concurrence. The most common forms of discipline in the House are now “expulsion,” “censure,” or “reprimand,” although the House may also discipline its Members in other ways, including fine or monetary restitution, loss of seniority, and suspension or loss of certain privileges. In addition to such sanctions imposed by the full House of Representatives, the standing committee in the House which deals with ethics and official conduct matters, the House Committee on Ethics—formerly called the Committee on Standards of Official Conduct—is authorized by House Rules to issue a formal “Letter of Reproval” for misconduct which does not rise to the level of consideration or sanction by the entire House of Representatives. Additionally, the Committee on Ethics has also expressed its disapproval of certain conduct in informal letters and communications to Members.
Here's a link for the U.S. Constitution Article 1, Section 5, Clause 2:
Found this old article that points to where in the Constitution...
Expulsion, Censure, Reprimand, and Fine: Legislative Discipline in the House of Representatives April 16, 2002 – June 27, 2016 RL31382
https://www.everycrsreport.com/reports/RL31382.html
The House of Representatives—in the same manner as the United States Senate—is expressly authorized within the United States Constitution (Article I, Section 5, clause 2) to discipline or “punish” its own Members. This authority of the House to discipline a Member for “disorderly Behaviour” is in addition to any criminal or civil liability that a Member of the House may incur for particular misconduct, and is used not merely to punish an individual Member, but to protect the institutional integrity of the House of Representatives, its proceedings, and its reputation.
The House may discipline its Members without the necessity of Senate concurrence. The most common forms of discipline in the House are now “expulsion,” “censure,” or “reprimand,” although the House may also discipline its Members in other ways, including fine or monetary restitution, loss of seniority, and suspension or loss of certain privileges. In addition to such sanctions imposed by the full House of Representatives, the standing committee in the House which deals with ethics and official conduct matters, the House Committee on Ethics—formerly called the Committee on Standards of Official Conduct—is authorized by House Rules to issue a formal “Letter of Reproval” for misconduct which does not rise to the level of consideration or sanction by the entire House of Representatives. Additionally, the Committee on Ethics has also expressed its disapproval of certain conduct in informal letters and communications to Members.
Found this old article that points to where in the Constitution...
Expulsion, Censure, Reprimand, and Fine: Legislative Discipline in the House of Representatives April 16, 2002 – June 27, 2016 RL31382
https://www.everycrsreport.com/reports/RL31382.html
The House of Representatives—in the same manner as the United States Senate—is expressly authorized within the United States Constitution (Article I, Section 5, clause 2) to discipline or “punish” its own Members. This authority of the House to discipline a Member for “disorderly Behaviour” is in addition to any criminal or civil liability that a Member of the House may incur for particular misconduct, and is used not merely to punish an individual Member, but to protect the institutional integrity of the House of Representatives, its proceedings, and its reputation.