Yes, Steve King is up for reelection. Other than him, I'm not following where candidates stand on this. I can't name you any that have called for him to step down either. I don't sit around scanning different candidates' web sites across the country for their positions every day. And candidates in an election year are certainly not the first or the tenth type of person I go to to find a principled position on something that I can use as any kind of a moral compass.
Well, at least you were able to provide one. Better than anybody else could do.