"Impeach" is just a formal accusation (think of it like an indictment in a regular court). An official can be impeached, but unless they get convicted then it means nothing. House of Representatives = Impeaches Senate = Convicts or acquits after trying the alleged crime someone was impeached for. And even if the Senate were to acquit the actual sanctions are a separate proceeding. For a *sitting* President, they would have to decide whether or not to remove him from office. Since Trump is out of office, the worst they can do is bar him from ever holding elected office in the future.