Members of Congress rise to applaud during a GOP-sponsored address by Israeli PM Benjamin Netanyahu. Republican senators, like Netanyahu, hope to scuttle a pending nuclear deal with Iran. Tom Williams / CQ-Roll Call / Getty Images There’s a charming naiveté to the open letter [PDF] by 47 Republican senators that condescendingly seeks to explain features of the U.S. constitutional system to Iran’s leaders that they otherwise “may not fully understand.” The missive warns that, with respect to “your nuclear negotiations with our government … any agreement regarding your nuclear-weapons program that is not approved by the Congress” could be revoked by the next president “with the stroke of a pen and future Congresses could modify the terms of the agreement at any time.” Beyond the amusing inaccuracies about U.S. parliamentary order , it seems there are some features of the nuclear negotiations that the signatory senators don’t fully understand […]