What is to accuse a public official of a crime while he is still in office?

Impeachment is the act wherein a person or group of individuals accuse a public official, such as a government body or head of a crime, while he or she is still in office. The Senate (Group of Senators) is the one responsible to hold the case or trial, while the House of the Representatives are commonly the people responsible for the said impeachment, they can vote against a specific government body to be impeached.