Historians are being very, very, very unfair to the President.

[NNadir]

5. It wasn't Buchanan himself as I understand it, but rather his Secretary of War...

...John B. Floyd, who later went on to become a Confederate general.

In many ways, despite being one of the most experienced people to assume the office of the Presidency, Buchanan strikes me as a "deer in the headlights" kind of guy.

Also, we still do not have full insight as to whether or not Trump was/is a Russian agent. Therefore the "traitor" designation doesn't hold up.

It is also notable that former President John Tyler was also a traitor, endorsed secession, and having been elected to the Confederate Government's House of Representatives, although he died before he could serve.