I take it you mean a jury trial and not attainder by Congress. In a sane world, it would not take much to come back with a swift finding of guilt for treason according to the definition listed in Article 3 Section 3 of the Constitution.
With the "living Constitution" interpretation of the document, if we dispose of the EC, couldn't also suspend annoyances like a strict demand that we not draw and quarter traitors, or for that matter, that the "traitor" definition be expanded to include registered democrats?
Ever notice how 'them unintended consequences' tend to bite the Left, a lot? (Frankly, it's because they are THAT F#CKING STUPID, but this is a different discussion.)