CNN's Umaro Djau, Deirdre Walsh, Ed Payne and Tracy Sabo contributed to this report.

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CNN's Dan Lothian in Las Vegas and Dana Bash, Ed Payne, Deirdre Walsh, Kevin Liptak, Catherine E.

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Two weeks ago, US Congressman Joe Walsh published an op-ed in the The Washington Times in which he called for the US and Israel to abandon the two-state solution.

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CNN's Ed Payne, Matt Smith, Mike Pearson, Jessica Yellin, Deirdre Walsh, Lisa Desjardins, Ted Barrett and Ashley Killough contributed to this report.

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