"On June 4th, 1963, President Kennedy signed Executive Order 11110."
https://yaliberty.org/news/jfk-and-the-federal-reserve-executive-order-11110/
"Marrs alleges that the issuance of Executive Order 11110 was an effort by Kennedy to transfer power from the Federal Reserve to the United States Department of the Treasury by replacing Federal Reserve Notes with silver certificates."
https://en.wikipedia.org/wiki/Executive_Order_11110
"What E.O. 11110 did was to modify previous Executive Order 10289, delegating to the Secretary of the Treasury various powers of the President. To these delegated powers, E.O. 11110 added the power to alter the supply of Silver Certificates in circulation. Executive Order 11110, therefore, did not create any new authority for the Treasury to issue notes; it only affected who could give the order, the Secretary or the President."
https://m.huffpost.com/us/entry/4287519
"Therefore, my statement in The Creature from Jekyll Island is correct. EO 11110 did not order the printing of Silver Certificates. It ordered the amendment of a previous executive order so that the United States Code would authorize or "empower" the Secretary of the Treasury to issue Silver Certificates if the occasion should arise."
https://freedomforceinternational.org/position-statements/jfk_and_fed/