John Thune would not “automatically” lose his Senate job just because someone censured him. A censure is usually a formal public condemnation, not a removal from office or a legal penalty.

What censure means

  • It is a political reprimand.
  • It usually does not remove committee roles, leadership roles, or the Senate seat by itself.
  • Any real consequences depend on what the Senate or his party decides afterward.

What could happen next

  • He may face public criticism and pressure from voters or colleagues.
  • Party leadership could ignore it, distance itself, or push for a different outcome.
  • If the issue is serious enough, there could be further ethics or political fallout.

In plain terms

A censure is basically a formal “we strongly disapprove,” not “you’re out.” For a Senate leader like Thune, the practical effect is mostly political unless it leads to more action.

One important note

The search results I found do not show that John Thune has been censured, only that he is the Senate Republican leader and has recently been in the news on policy issues.

TL;DR: If John Thune were censured, he would usually keep his seat, but he could face political damage, pressure from his party, and possible leadership consequences.