Saudi Arabia is mounting a last-ditch campaign to scuttle legislation allowing families of victims of the Sept. 11, 2001 attacks to sue the kingdom — and they're enlisting major American companies to make an economic case against the bill.General Electric, Dow Chemical, Boeing and Chevron are among the corporate titans that have weighed in against the Justice Against Sponsors of Terrorism Act, or JASTA, which passed both chambers unanimously and was vetoed on Friday, according to people familiar with the effort.