The number of retired generals and admirals signing on to a letter to Congress rejecting the Iran nuclear deal continued to swell Thursday, with some 214 of the former high-level U.S. military officers putting their stamp on the document that asserts the “agreement will enable Iran to become far more dangerous” and “introduce new threats to American interests.”

The letter was initially sent to House and Senate leaders from both parties on Tuesday with 190 signatures — among them several individuals who’ve held high-level positions in past administrations, including former Navy Vice Admiral John Poindexter, who served as President Ronald Reagan’s national security adviser.