Can you please explain precisely why the President does not have the legal authority to compel internet providers to follow his instructions during a time of wa

Can you please explain precisely why the President does not have the legal authority to compel internet providers to follow his instructions during a time of war right now? Please cite independent legal authorities. Also, given the atrocious way in which Patriot Act powers have been abused, let alone the manner in which illegal telecom surveillance has been completely ignored (silly people, prosecution of criminals is only for citizens, not government agents!), why exactly should we given Lieberman the benefit of the doubt on these issues at all? Lieberman has failed to investigate any of those issues despite chairing the Committee on Homeland Security and Government Affairs. What else does Lieberman have to do in order to convince us that he does not respect civil liberties at all?