Michael Otsuka (LSE) invited me to share his letter to the Trustees, which appeals, suitably, to institutional self-interest and proposes an alternative strategy that (though one that might still leave Prof. Salaita in danger, but at least would mitigate the harm and gives the Board a way out of the current mess they've made short of wholesale retreat):
Dear Trustees of the University of Illinois,
I am a Professor at the London School of Economics. I am also a faculty-elected member of the LSE's Court of Governors. I write, however, in an individual capacity.
If you withhold pro forma approval of Professor Steven Salaita's appointment alongside the others when you meet on September 11, you will make clear that associate and full professors at your university do not have tenure at the outset of their appointments. Rather, even after the starting dates listed on the letters of offer they have signed, their jobs may vanish without any demonstration of cause by normal procedures that apply to tenured professors.
You will also make clear that the assurances, norms, and practices on which academics rely when they resign their posts, in order to take up jobs elsewhere, do not apply when it comes to offers from the University of Illinois.
You will thereby undermine your ability to recruit the best scholars and teachers.
I therefore urge you to follow the recommendation of the AAUP to treat "Professor Salaita’s situation as that of a faculty member suspended [with pay] from his academic responsibilities pending a hearing on his fitness to continue."
Otherwise, you will provide overwhelming grounds for AAUP censure, of which academics around the world will take note.