Obama no longer cares whether the GOP is outraged

[JDPriestly]

17. Because of the separation of powers clauses in the US Constitution:

Article I, section 8 (Authority of Congress)

The Congress shall have power to lay and collect taxes, duties, imposts and excises, to pay the debts and provide for the common defense and general welfare of the United States; but all duties, imposts and excises shall be uniform throughout the United States;

. . . .

To regulate commerce with foreign nations, and among the several states, and with the Indian tribes;

Article II, section 2 (Powers of the President)

The President . . . shall have power, by and with the advice and consent of the Senate, to make treaties, provided two thirds of the Senators present concur; . . . .

https://www.law.cornell.edu/constitution

The link page connects to the specific pages for Articles I and II.

Congress has the authority of advise and consent with regard to treaties and is arguing that the Iran agreement is the equivalent of a treaty.