Trump clearly dd NOT threaten to deport Musk.
You can't deport legal citizens, especially ones like Musk on who America depends for taking US astronauts to the SpaceStation.
This was a deliberate leading question by fake news media who hope Musk will create another party and split Republican votes which will work fine for Democrats.
Teddy did that with the Bull Moose Party just over a 100 years ago. Not going to happen again.
He could do what you describe easily and put billions behind it
Same deal with Reform and Tories in the UK. Takes some time and money.
Could the GOP die? It’s possible... Some here would rejoice at it.