The current debate right now is whether or not the US Senate can hold an impeachment trial and potentially convict an ex-president who is now technically considered a private citizen. To be clear, the impeachment occurred during the presidency, but the trial will be held after his presidency. The speculated purpose is to prevent the ex-president from running for office ever again. I'll take it a step beyond: Could the house/senate impeach and convict any private citizen? I wasn't sure if there's specific language in the US constitution that describes that impeachment is reserved specifically for a sitting president, or if it's another case of "this is how it's historically been done but it's debatable."