Most of them are open weight, ban them how? An executive order can only prohibit their use within/for the federal government, that's it.
The administration may try, and the bigger more risk adverse companies will capitulate willingly, but its about as ineffective of a ban as you can get. It'd be like trying to ban running Linux on your home computer because it "might be able be used to conduct cyberattacks"
I wouldn't be surprised if linux is banned in the next couple decades. They might make it where all new hardware sold can only run some validated set of OSs. They might try and hunt for unregistered compute leaking its ip on the internet and target it in some way.