According to you. But see the following
ARTICLES OF IMPEACHMENT of the then Senator William Blount.
And, our Founders disagree with you.
Hamilton, in explaining the Constitution’s impeachment provisions, described impeachable offenses as arising from
“the misconduct of public men, or in other words, from the abuse or violation of some public trust.”
And during the South Carolina ratification debates, Gen. CHARLES COTESWORTH PINCKNEY notes:
“If the President or the senators abused their trust, they were liable to impeachment and punishment; and the fewer that were concerned in the abuse of the trust, the more certain would be the punishment”.
Moving on to the Massachusetts ratification debates, Gen. BROOKS, (of Medford.) points out, .
“The Senate can frame no law but by consent of the Representatives, and is answerable to that house for its conduct. If that conduct excites suspicion, they are to be impeached, punished, (or prevented from holding any office, which is great punishment.)”
Later on, Mr. Stillman confirms:
“Another check in favor of the people is this – that the Constitution provides for the impeachment, trial, and punishment of every officer in Congress, who shall be guilty of malconduct. With such a prospect, who will dare to abuse the powers vested in him by the people”?
And in the Virginia ratification debates, Randolph in defending the proposed constitution askes:
“Who are your senators? They are chosen by the legislatures, and a third of them go out of the Senate at the end of every second year. They may also be impeached. There are no better checks upon earth”.
Seems quite clear that impeachment was intended for all those exercising a federal public trust who violate that trust.