I'm not sure how you got the idea that "former President Trump" is incorrect. It's pretty standard style. Reuters uses the exact same terminology for Obama [1]

I'm not sure how you got the idea that "former President Trump" is incorrect. It's pretty standard style. Reuters uses the exact same terminology for Obama [1] too. Same goes for the AP [2] and the BBC [3]. Even the U.S. Government prescribes the use of "former President" [4] [1] https://www.reuters.com/world/us/obama-holds-groundbreaking-ceremony-presidential-center-chicago-2021-09-28/ https://www.reuters.com/world/us/obama-holds-groundbreaking-... [2] https://apnews.com/article/ed-gillespie-terry-mcauliffe-ralph-northam-barack-obama-virginia-ad0de7d8778a879dcba2e898474cc3e2 https://apnews.com/article/ed-gillespie-terry-mcauliffe-ralp... [3] https://www.bbc.com/news/uk-scotland-58937970 https://www.bbc.com/news/uk-scotland-58937970 [4] https://www.govinfo.gov/content/pkg/GPO-STYLEMANUAL-2016/pdf/GPO-STYLEMANUAL-2016.pdf https://www.govinfo.gov/content/pkg/GPO-STYLEMANUAL-2016/pdf...