Picture By Google Search
Civics 1.0.1: POTUS alone cannot undo, change or ratify any US Amendment. Only the 2/3 of the state representatives, the US Senate and the House of Representative can ratify/change the US Constitutional Amendments. Or the Constitutional Convention by 2/3 of the state legislatures can change/ratify the US Constitutional Amendment. I'm not a lawyer, but a historian. The lawyers can take this up further.