Version 1 here (I can't post on-site trainer as new version easily)
I was surprised Pony couldn't create such a famous location on its own, so I made a LoRA for it with public domain pictures. No Presidents were tagged in the making of this LoRA, and I think all the guests included will make it poor at producing any single person. Adds an additional 75 images to the 12 of the last version (which only included pics with no human heads).
General: oval_office, resolute_desk, desk
Front: seal of the president of the United States, curtains, window, flag, american flag, painting (object) NEGATIVE: Wall (helps cut down on the single window)
From desk’s left: from side, glass door,
From desk’s right: from side, wooden door, bookshelf,
From desk’s rear: from behind, grandfather clock, fireplace, couch,
To have someone sitting at desk: sitting, behind desk,

General clutter (this shifts around even within a single term): bust (sculpture), seal on floor, corded phone, globe, potted plant, plant, carafe
JFK era: 1960s, blue carpet (two images in data set, only one has carpet visible)
Desk put on tour
Carter era: 1970s, print carpet, flower print, flower carpet
Reagan (early): 1980s, print carpet, flower print, flower carpet
Reagan (late): 1980s, seal on floor (the color is all off on the photos of era, not guessing actual color)
Bush Sr. era: Not in data set (no good images in Commons, spent most of administration in different, private, part of White House)
Clinton Era: 1990s, blue carpet,
Bush Jr. era: 2000s, beige carpet
Obama era: 2000s, beige carpet, wallpaper (object), striped wall
Trump era: 2010s, beige carpet, wallpaper (object)
(I aware it’s actually a rug, but I know SD will handle it better as a carpet)

As TD was all public domain photos and I don't think I can hold copyright on tags (being factual list of contents), the training data is up for DL. You can do whatever you want with it, but I'd prefer being credited.