Austin Bay doesn't believe there should be:

"Not if we want to keep a federal system.

Unless we’re talking about fighting a war, a “let the military do it” idea is bad for a democracy. What the military can do is provide extraordinarily fine “special asset” coordination. Coordinating air assets (especially helicopters) in an “overwhelmed environment” is a job the military must be good at doing. Likewise coordinating ships and large-scale truck convoys. Coordination doesn’t necessarily mean command– and that’s an important distinction."