Did Chicago Mayor threaten the Supreme Court?


“Maybe they’ll see the light of day,” Daley said. “Maybe one of them will have an incident, and they’ll change their mind overnight, going to and from work.”
Incredible.   If Daley had not said this, in the context of a pending case, one would think it was lifted directly from the script of a mobster movie.  Is this not a threat of violence toward United States Supreme Court Justices in order to exert influence ?