the us navy exists across several sections of the military and two levels of government. so there are something like eight groups the layman would call a navy. and naval strength isn't measured exclusively in ships, it includes carrier based fighters/drones/choppers and coastal defences, specifically anti ship missile. and navies are unlike armies in that the standing strength is less relevent because merchant marine works differently to conscripted infantry.  the enemy can't really pull a hundred warships out of their ass so as long as you've got as many under construction you'll be right.  trump pulled out of the tpp, effectively the tax the quad paid for us naval protection, his trade protection plan runs contrary to it as well so he's not changed his position.  it would effectively leave the us far less reason to defend australia. it will probably mean the f35 program here is bathtubbed by program costs for example, allies will be reduced to rental customers and so won't follow through with acquisition.
Australia