With Senate Democrats blocking a procedural vote on on the Iran deal, a tense showdown between the White House and the Republican-controlled Congress has been averted. Carolyn Kaster/AP hide caption

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Incoming Senate Majority Leader Mitch McConnell, R-Ky., leaves a closed-door policy meeting at the Capitol on Dec. 2. McConnell says he wants to make the Senate work the way it used to, but not all Republicans are on board. J. Scott Applewhite/AP hide caption

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Their Senate, Their Rules: GOP May Allow Blocking Of Nominees Again

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Senate Democrats at the White House last fall during the government shutdown fight. Pablo Martinez Monsivais/AP hide caption

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Members of the House of Representatives enter the U.S. Capitol on Monday. Congress failed to reach a budget agreement by the midnight deadline triggering a partial shutdown of the government. Win McNamee/Getty Images hide caption

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