Plot summary
The election is over: none of the presidential candidates have enough electoral college votes, so the election will be decided by the House of Representatives. Elizabeth learns that Russia may be expanding their nuclear program, but then finds out that a rogue Russian is shipping a nuclear centrifuge to Iran. The Navy stops the ships and recoups the centrifuge. UN inspectors fly in to Iran to inspect their facilities and are stopped by Iranian soldiers.
Credits
Adapted from Wikipedia contributors, Madam Secretary season 3. HTML formatting and reference markers removed.