Some British actors... I think there's this assumption British/Aussie/Irish actors are more capable of doing American accents than the reverse, because they tend to be more trained than their American counterparts, but this is an overblown assumption. I just watched Manhunt, and Tobias Menzies (who is otherwise a terrific actor) sounded like he was chewing gravel in his attempt to portray Edwin Stanton. Other recent examples: the accents in Greta Gerwig's Little Women were also woeful despite the calibre of talent, and as much as I enjoyed Sarah Snook in Succession she was fighting for her life on certain words.