Senators aren’t impeached either. It’s a little simpler in that they can be expelled by a two-thirds Senate vote.
There’s no recall because, among other reasons, the Constitution envisaged appointment by state legislatures and no one wanted senators being replaced with every state election instead of serving six-year terms.
Two thirds, eh? That's a pretty high bar to reach, but I'll bet Mr. Texas Toast can do it. It's been said that he's the most hated man in the Senate.