Immunity for Telecoms or Bush

Why is G.W. Bush so adament about getting immunity for giant telecoms concerning evesdropping on US citizens? The telecom companies don't seem to be begging for immunity. Why would that be? Possibly because the US government already indemnified the telecoms against any possible lawsuits.

It seems much more likely that immunity for Telecoms is necessary so that we don't learn about exactly what G.W. Bush has been up to during the last 7 years. Bush has all but said this is the case:

Allowing the lawsuits to proceed could aid our enemies, because the litigation process could lead to the disclosure of information about how we conduct surveillance