Does Chuck Schumer's opposition to Iran deal matter?

Sen. Chuck Schumer's rebuke of President Barack Obama's nuclear deal with Iran is stinging but it likely isn't enough to derail the historic accord.

The Republican-controlled Congress is expected to pass a measure disapproving of the deal, which Obama has pledged to veto. And despite Schumer's move, both the administration and congressional Democrats supporting the Iran deal remain confident they have the votes to sustain the veto. They're looking to the House of Representatives as the firewall to ensure the nuclear agreement can be implemented.