Just this, really.
Labour’s leader has lied on national television about his involvement with terrorist-linked organisations. If it were a normal political party and had not become a strange personality cult, its leader would have already been pressured to resign. Discuss.— Rob Marchant (@rob_marchant) August 13, 2018
We might also add that, in an unprecedented development, Labour’s press office has also lied about this. As an ex-staffer, I can say that I have never before experienced any other example of the latter happening in my life, and I am deeply ashamed.
Sad to say, though, Corbyn himself does have previous: I have just remembered him telling these three lies in short order to Andrew Marr in February.