Answer:
The U.S. Constitution article that would most likely deal with the issue of trying cases involving treason against the country is Section 110 of Article III.
Step-by-step explanation:
The Constitution classifies in two the crime of treason:
1. The levying of war against the United States, and
2. Adhering to their enemies, giving them aid and comfort.
By Section 110 of Article III. of the Constitution of the United States, it is declared that:
"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."