Every citizen, and every officer of government who is required by Article Six to take the oath, has to determine constitutionality. If they won't, they are either a poor citizen, or a sworn officer who cannot possibly keep the oath and provide appropriate checks and balances within our form of government.
"Constitutions are not designed for metaphysical or logical subtleties, for niceties of expression, for critical propriety, for elaborate shades of meaning, or for the exercise of philosophical acuteness or judicial research. They are instruments of a practical nature, founded on the common business of human life, adapted to common wants, designed for common use, and fitted for common understandings."-- Joseph Story, Commentaries on the Constitution of the United States
"We the people are the rightful masters of both Congress and the courts, not to overthrow the Constitution but to overthrow the men who pervert the Constitution."
-- Abraham Lincoln
OK, so the fact that sworn officers of government (Supremes) have deemed these congressional-executive trade agreements to be constitutional, plus the fact that our elected, and sworn, representatives have continued to agree to and implement these agreements, means that they're constitutional, no?