I wouldn't want Raab in charge, but in answer to your point, I'm not aware of anything legally that would prevent that.
Well that's kind of it, we have all this rinse and repeat pms being OK until they fall out of favour it just goes around and around, distracting them from the job they are supposed to be doing. We had Cameron give us the Brexit vote he didn't like the result so we ended up with the wishy washy old hag may until they realised she was about as much use as a chocolate teapot regards Brexit so along came Boris who actually got us what we wanted eventuallybut is now another liability so must go, and so the bollocks goes on, how long before the next becomes the pain in the arse.