It's a bit of a trend in US politics.

JFK = John F. Kennedy

AOC = Alexandria Ocasio-Cortez

MTG = Marjorie Taylor Greene

I think it has more to do with the US preferring to use the second name initial as an identifier, like with George Bush and George W. Bush. Three letters just roll off the tounge better, while everyone know who is meant. Of course, with AOC it's not her second name but a classic Spanish doubled surname. Though it couls be from somewhere else, too. Idk what countries all have doubled surnames.