Trump has a very long history of using this kind of thing to say what the campaign is thinking about doing.
If you want to stop that kind of fascist outcome, about the only real option is to make sure Biden gets reelected and has a Democratic congress to help him.
Trump is your dumbass wingnut uncle, the loudmouth with an opinion he loudly shares about everything, always wrong and always mean. That’s all he is, plus money all his life, so he’s famous and about 40,000,000 dumbass wingnut uncles just love him.