All our subs are nuclear.
The US has a good number of non-nuclear submersibles for specialized missions such as SEAL team delivery, deep diving rescues, sensor & mine delivery.
But all the true submarines are nuclear, including SSNs, SSBNs & SSGNs.
There has been some interest in adapting German Type 212 non-nuclear AIP subs (super-quiet) for littoral combat roles, but so far, nothing specific has transpired in that direction, that I can find.
Well all our subs are nuclear powered but the Ohio class ( Boomers) carry trident missiles which are nukes. The Virginia class and our sea wolves carry I believe tomahawk missiles.
Most likely Trump does have a couple of Boomers hanging around Russia.