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.Section 3 of the Fourteenth Amendment also makes it clear that:
No person shall be a Senator or Representative in Congress, or elector of President and Vice President, or hold any office, civil or military, under the United States, or under any state, who, having previously taken an oath, as a member of Congress, or as an officer of the United States, or as a member of any state legislature, or as an executive or judicial officer of any state, to support the Constitution of the United States, shall have engaged in insurrection or rebellion against the same, or given aid or comfort to the enemies thereof. But Congress may by a vote of two-thirds of each House, remove such disability.
For a subset of this group of Constitutionalists which calls itself the "oathkeepers" needs to be reminded that they are also subject to UCMJ if they are in the military. The UCMJ has sections which strictly prohibit many things done by the right. One is showing contempt toward the President (and other government officials):
10 U.S. Code § 888 - Art. 88. Contempt toward officialsThere is also 10 U.S. Code § 894 - Art. 94. Mutiny or sedition
Any commissioned officer who uses contemptuous words against the President, the Vice President, Congress, the Secretary of Defense, the Secretary of a military department, the Secretary of Homeland Security, or the Governor or legislature of any State, Commonwealth, or possession in which he is on duty or present shall be punished as a court-martial may direct.
(a) Any person subject to this chapter who—18 U.S. Code Chapter 115 addresses treason, sedition, and other subversive activities with 18 U.S. Code §2385 specifically prohibiting advocating the overthrow of the US Government. These specific laws would be in line with Article III, Section iii of the Constitution.
(1) with intent to usurp or override lawful military authority, refuses, in concert with any other person, to obey orders or otherwise do his duty or creates any violence or disturbance is guilty of mutiny;
(2) with intent to cause the overthrow or destruction of lawful civil authority, creates, in concert with any other person, revolt, violence, or other disturbance against that authority is guilty of sedition;
(3) fails to do his utmost to prevent and suppress a mutiny or sedition being committed in his presence, or fails to take all reasonable means to inform his superior commissioned officer or commanding officer of a mutiny or sedition which he knows or has reason to believe is taking place, is guilty of a failure to suppress or report a mutiny or sedition.
(b) A person who is found guilty of attempted mutiny, mutiny, sedition, or failure to suppress or report a mutiny or sedition shall be punished by death or such other punishment as a court-martial may direct.
And I have yet to see a "Constitutionalist" show me where exactly the Second Amendment happens to explicitly repeal Article III, Section iii. We can also add that the Constitution was partially a reaction to Shays Rebellion.
The really big point that "constitutionalists" fail to understand is that they are bound by the laws which have been made in accordance to the Constitution. If they believe the laws were not lawfully enacted, then they are to use the proper constitutional framework, which is not rebellion, but the courts and legislature.
That what is meant by the rule of law: The US is a nation of laws, not people. Article VI, Clause 2 of the Constitution states:
This Constitution, and the Laws of the United States which shall be made in pursuance thereof; and all treaties made, or which shall be made, under the authority of the United States, shall be the supreme law of the land; and the judges in every state shall be bound thereby, anything in the constitution or laws of any state to the contrary notwithstanding.
The problem is that we have seen people who claim to believe in the US Constitution who fail to understand basic concepts such as the Feds can regulate Interstate Trade (Article I, Section 8, Clause 3), yet we have seen silly and futile attempts to thwart this by the right.
In short, people who call themselves "Constitutionalists" need to bone up on what exactly they claim to believe in.