Plot summary
Elizabeth reluctantly hosts a Christmas party to gratify party donors and also hopes to sway a few Senate votes for a landmine treaty she is pushing to ratify. The CIA and the FBI coordinate to investigate Senator Carpenter. Elizabeth and Morejon team up to keep Carpenter at her party while his residence is being searched. Conrad signs the ratified treaty. After Carpenter is brought in for questioning, Henry accuses him of selling American lives to keep his son out of prison for financial misconduct, and Carpenter falls apart.
Credits
Adapted from Wikipedia contributors, Madam Secretary season 4. HTML formatting and reference markers removed.