Remember this when you vote today:
Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort. No Person shall be convicted of Treason unless on the Testimony of two Witnesses to the same overt Act, or on Confession in open Court.
The Congress shall have power to declare the Punishment of Treason, but no Attainder of Treason shall work Corruption of Blood, or Forfeiture except during the Life of the Person attainted.
Article 3, Section 3 of the United States Constitution.
The argument could easily be made as he gave tax payers money to politicians/countries that are currently in alliance against us, as well as giving aid and comfort to a man who openly declared war against the United States of America.