Any pause will have to be a global treaty; the unfortunate reality is that we're in an arms race now, and despite Sanders' threats otherwise, I don't think there is going to be much will to pause in the US while China keeps developing.
And to be clear, I think it would be every wise to pause development and, afterwards, keep the pace slow. We know how to make "AI" more capable, but we don't know how to make it stay aligned with human goals. The technology is useful and isn't going anywhere, but that doesn't mean we have to develop it as quickly as possible without regard to the real dangers it brings with it.