Institutional power vacuum crisis triggered by the unsigned 25th Amendment transfer letter, forcing Leo and team to improvise chain-of-command amid assassination aftermath.

In Toby's office amid escalating White House chaos, C.J. strides in and brusquely confirms with Bonnie that the crisis team is on speakerphone, then bypasses her to directly hail Sam. …

In Leo's office, Margaret reveals the President's failure to sign the routine power-transfer letter before anesthesia, exposing a glaring constitutional vulnerability amid the assassination crisis. Leo brushes it off, fixated …