There has been a lot of buzz in the media about whether the Senate can actually convict and block Trump after he's left office. Scholars seem split, but it does seem possible depending on which bits of the constitution you read.

Two articles I found interesting:

https://www.businesslive.co.za/bd/wo...eaving-office/

https://www.wusa9.com/article/news/v...d-307bb4cae87c

There's also a question of whether he'd be entitled to all the perks of being a former president, such as salary, paid staff, etc.