Senate Foreign Relations Committee Chairman Sen. Bob Corker, R-Tenn., center, and the committee's ranking member Sen. Ben Cardin, D-Md., right, were all smiles April 14 after the committee passed an agreement on oversight of Iran negotiations. But the bill has run into some outspoken opponents in the full Senate. Andrew Harnik/AP hide caption

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Sen. Bernie Sanders, I-Vt., speaks at a rally demanding presidential action to raise the minimum wage to $15 an hour. Sanders will run to Hillary Clinton's left, trying to elevate economic issues. Win McNamee/Getty Images hide caption

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Sen. Mitch McConnell (right) walks with Sen. John Barrasso to a news conference about the compromise Tuesday. Evan Vucci/AP hide caption

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Cardin, right, confers with Senate Foreign Relations Committee Chairman Sen. Bob Corker, R-Tenn. during a committee markup meeting on the proposed nuclear agreement with Iran Tuesday. Win McNamee/Getty Images hide caption

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Think of reconciliation as the biggest ladder in the game Chutes and Ladders — a procedural shortcut. But a presidential veto of whatever gets passed through reconciliation means tumbling back down a chute. Ben Husmann/Flickr hide caption

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Senate Majority Leader Mitch McConnell says he won't let the chamber vote on Loretta Lynch — the nominee to become the next attorney general — until the Senate passes its human trafficking bill. Mark Wilson/Getty Images hide caption

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Tom Cotton, R-Ark., the freshman senator and Harvard graduate senator with a record of tough talk on foreign policy. Carolyn Kaster/AP hide caption

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"It is a waste of time. We will not allow a conference to take place. It won't happen," Senate Minority Leader Harry Reid said Thursday about the possibility of the two chambers reconciling Department of Homeland Security funding bills. J. Scott Applewhite/AP hide caption

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