In any event, Corbyn is currently being challenged for his post as head of Labour by another MP, Owen Smith. And Khan has just come out hard for Smith, though his focus was not on the issue of anti-Semitism but on Corbyn's general lack of leadership, particularly on the "Brexit" vote. All of that information is background for this:
Took about 5 minutes from Khan tweeting his Guardian article backing Smith for him to get a tweet like this... pic.twitter.com/YDuvYcg24X— Rupert Sutton (@StubbsMaloy) August 20, 2016
Five minutes. That didn't take long at all (the photo, incidentally, is genuine -- Khan really did eat Matzah at a Passover event during his campaign).