> the left thinks that the right wants a power grab to stop left from coming back

It would probably help if Trump didn't fantasize about this publicly all the time

> the right thinks that if they don't keep their power now, the left will take it and keep it using immigrants

The left will "take it" by being elected, if they are in fact elected. That's the extremist threat the right is worried about?

What does "keep it using immigrants" mean?