I was watching Trump's State of the Union address on C-SPAN and saw a link to FDR's 1942 address: https://www.c-span.org/video/?152565-1/franklin-d-roosevelt-state-union-address
His accent was not what I expected. He cuts off his 'r's in "similar" and "empire." What type of accent is this?
This is the Trans-Atlantic or Mid-Atlantic accent, which was affected by East Coast elites and some actors to make them sound more cultured - that is, English without straight up doing an English accent. This post has some information from /u/grantimatter about how people put on the accent. This podcast has an interview with a linguist who talks more about it.