When was the last time a sitting US president said "nigger" in public, on the record? | AskHistorians Archive Observer

When was the last time a sitting US president said "nigger" in public, on the record?

by datums

Searocksandtrees

FYI there is a similar question in progress

https://www.reddit.com/r/AskHistorians/comments/3assdu/who_was_the_last_potus_to_be_quoted_saying_the/