This makes zero sense.
1. Open source models are already out there and they are good. Good luck with banning their use.
2. Any ban is a local ban, the best Trump can do is to coerce its allies (whose number seems to be dwindling week by week). Meanwhile China and co. will progress anyway.
3. What about the common sense and instead of saying "agent did it" we return to the times where the person using a tool was responsible for using it in the first place? And if the vendor of the tool is unable to make it safe to use (well, they well do, but they don't want to do it as the functionality is limited), it should be accompanied by a warning with a clear explanation of who exactly is responsible.
4. There is no guarantee the next generation of models will "mature" to the point of not having these flaws; on the contrary, the evidence so far shows the opposite.