I did not know of any controversy in the Missouri Senate race.
Also, I do not think Martha McSally's appointment was illegal. Yes, she lost her career against Krysten Sinema, but that race was for the seat that Jeff Flake was vacating. McSally, on the other hand, was appointed by Arizona Governor Doug Ducey after Jon Kyl announced that he would only be serving until the end of the 115th Congress, once John McCain died. The first two are questionable, but I did not know of any offense in the MO career, and ultimately it was the Arizona governor who could name someone for McCain's seat before special elections are held next year. Si McSally decide to run for a full term).