[Southack]

"Senators are not subject to recall, as the US Constitution makes no provision for same."

Perhaps, but what does the Constitution say about powers that are not reserved to the federal government...for whom are those powers reserved?

[Poohbah]

Perhaps, but what does the Constitution say about powers that are not reserved to the federal government...for whom are those powers reserved?

To the States and the People, respectively. However, determining whether a Senator is or is not a Senator is an exercise for the United States Senate, and no other entity.