Once impeachable offenses are established, the next step is to commence a trial. Once the House of Representatives impeaches, the Senate tries the accused. Senators are sworn in as jurors and rules for the proceedings are established. When a US President is impeached, the Chief Justice of the United States presides at the trial. A two-thirds majority is required to convict; otherwise, the accused is acquitted.
If a conviction is secured by the Senate, that brings immediate removal from office of the President. If such official is convicted, the Senate may take a second vote to determine whether or not to bar the official from holding any public office in the future. The Senate trial does not constitute a criminal trial and the Senate decision does not have power beyond removal from office and barring of future public office. The impeached official is still subject to criminal prosecution for any criminal offenses, if any, that were included in the articles of impeachment.