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Hasbro did several US presidents (Washington, Roosevelt, Eisenhower) and other historical military men (Patton, Lee, Ernie Pyle) during the late 90~early 00's run of the 1:6 GI Joe line. I have George myself and he's great. They can be had fairly cheap on eBay for $30~$60 bucks MIB. That's a steal seeing as they come with plenty of accessories and top notch outfits. In 2005, Sideshow also produced a George Washington figure, if you want something with a bit better sculpt and more pricey.
There's also several smaller 1:6 companies that did historical figures like Franklin Roosevelt, Stalin and good ol' Adolf. (He goes for OUTRAGEOUS prices on the secondary market, so don't bother.) There's also a 1:6 scale black buck figure that has Obama's head. You've probably seen it a random pic wielding a katana. Trump also has a 1:6 doll that came out long before he was president. It's got shitty 5 POA, but also a talking feature.
Last, the Soldiers Of The World figures from the 90's did ALOT of historical 1:6 figures, including some presidents. Their bodies are REALLY dated, but the clothes are excellent.
So yeah, there's plenty of presidents and famous people to be had in 1:6 scale.