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Two leading Republicans have dramatically quit the House’s “Gang of Seven” immigration panel, likely dealing a crippling blow to President Barack Obama’s top-priority effort to push through an immigration rewrite.

The two legislators blamed Obama’s practice of not enforcing laws, including immigration enforcement laws.

“We have reached a tipping point and can no longer continue working on a broad approach to immigration,” said a statement from the two Texas Republicans, John Carter and Sam Johnson, who were working with four Democratic legislators to craft a bill to increase immigration.