21. Impeachment charges are started by the*SenateSupreme CourtHouse of RepresentativesPresident

The impeachment process in the United States is initiated by the House of Representatives. Here’s a breakdown of how this works:

1. Initiation: Impeachment charges (articles of impeachment) can be introduced in the House of Representatives. This can be done by any representative.

2. Investigation: Once articles of impeachment are introduced, the House Judiciary Committee typically investigates the allegations and decides whether to recommend the articles to the full House.

3. Voting: If the committee approves the articles, the full House then debates and votes on them. If a simple majority of the members present vote in favor, the president is impeached.

4. Trial: Following impeachment by the House, the case then goes to the Senate, which conducts a trial.

5. Outcome: The Senate will then vote on whether to convict and remove the president from office. A two-thirds majority is required for conviction.

Therefore, the correct answer to your question is House of Representatives.