How do the House rules on impeachment legally change? by the speaker’s say-so? Or a House vote? or other?
house gets to make their own rules...
RATs changed rules when they got in power via vote...
Repubs changed rules via vote when they won...and so it goes...
https://www.npr.org/2019/01/04/682350038/democrats-vote-to-change-house-rules-after-taking-control-of-chamber
Constitution has no guidance on how to start impeachment proceedings.
Aticle 1 Section 2 Clause 5
The House of Representatives shall choose their Speaker and other Officers; and shall have the sole Power of Impeachment.
Article 1 Section 5 Clause 2
Each House may determine the Rules of its Proceedings, punish its Members for disorderly Behavior, and, with the Concurrence of two thirds, expel a member.
I alawys wonder how Alcee Hastings was ever able to serve in the House after his impeachment,conviction and removal from office.
Article I, Section 3, Clause 7
Judgment in Cases of Impeachment shall not extend further than to removal from Office, and disqualification to hold and enjoy any Office of honor, Trust or Profit under the United States: but the Party convicted shall nevertheless be liable and subject to Indictment, Trial, Judgment and Punishment, according to Law.