Byline: Michael Isikoff
The nation's telecommunications companies want immunity from lawsuits related to their participation in President Bush's warrantless-surveillance program, and to get it, they've been mounting an aggressive Capitol Hill lobbying campaign. Last week they played what they hoped would be their trump card: a letter backing their position from ex-attorney-general John Ashcroft and three other former top Justice officials. The quartet seemed to have special credibility on the issue: they had all once threatened to resign because of concerns about the top-secret spying program's legality. Republican Sen. Orrin Hatch called the letter "very interesting," adding …