How is comparing himself to someone who was in jail most of their lives, and who is African American?

https://www.yahoo.com/news/trump-news-today-anthony-pratt-104616965.html?fr=sycsrp_catchall
Trump compares himself to Mandela amid fears over Nato pull-out: Live

Donald Trump compared himself to South African civil rights hero Nelson Mandela on Monday as his legal woes deepened with the guilty pleas of two of his former attorneys.

The ex-president was speaking in Derry, New Hampshire, after officially registering for the state’s GOP primary.

Trump: Look what happened this weekend with two good people, they hound them and scare them. But we don't get scared. We don't get scared. I don't mind being Nelson Mandela

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How is comparing himself to someone who was in jail most of their lives, and who is African American?
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