The Wall Street Journal | Laurence Norman: A U.S. effort to enlist Europe in its pressure campaign against Iran faced a setback after officials said ministers from several European Union members will likely skip a summit organized by Washington on Iran and the Middle East.

The summit, which will be co-hosted by Poland and the U.S.�and take place in Warsaw,�was announced during Secretary of State Mike Pompeo�s tour of the Middle East last week.

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