From the Washington Post:
Members of Congress privately predicted that Hayden, who once enjoyed tremendous support on the Hill, would face a contentious confirmation process over the Bush administration’s domestic spying program. Other sensitive issues, such as the existence of secret prisons abroad for terrorism suspects, also are likely to arise.
“The calculus is that would be true about anybody at this point. Given all the other stuff, like secret prisons, the confirmation is going to be tough for anybody,” a senior administration official said.
Here.