I believe treason is literally defined in the constitution itself as taking up arms against the country. By that definition, I think there have been few to almost no treasonous people in recent decades.
From Article III: "Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort."
For example, if Russia met the definition of an enemy, and if the President compromised the interests on the country in favor of Russian interests (presumably for his own personal benefit), that would probably count. The compromise would have to be knowing, though, mere incompetence is not enough. So if the issue ever arose, Trump has a pretty good defense.
For example, if Russia met the definition of an enemy, and if the President compromised the interests on the country in favor of Russian interests (presumably for his own personal benefit), that would probably count. The compromise would have to be knowing, though, mere incompetence is not enough. So if the issue ever arose, Trump has a pretty good defense.