The jockeying reflects their struggle with how to stop a deal that looks almost certain to be implemented

WASHINGTON�Republicans united in their opposition to President Barack Obama�s nuclear accord with Iran fractured Wednesday about how to cast their votes.

House GOP leaders were forced to delay and quickly rejigger their approach for voting on the deal after some Republicans rejected the initial plan. The House is now expected to vote this week on a series of three measures aimed at expressing their opposition to the nuclear deal and leaving the door open to a lawsuit against the White House on the issue.

The jockeying reflects the Republicans� struggle with how to stop a deal that looks almost certain to be implemented despite their objections. Mr. Obama already has enough votes to ensure the accord can�t be blocked in the Senate, which could vote as early as Thursday.

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This article was written by Kristina Peterson for The Wall Street Journal on Sep. 10, 2015. Kristina Peterson covers Congress from the Wall Street Journal's Washington bureau.