Musk's contract with DOGE has expired. In other words, his contract with government has expired. So, deport him out of US government, to America, with the loads of other people who are not in government..
Many countries will be willing to give Elon Musk citizenship if the US attempts to deport him. I guess Canada will want him to relocate most of his business to the country. The US will lose one of the smartest minds and a major employer of labour if Elon leaves. From my observation, Trump is just bluffing, I don't think he is serious.