Sen. Susan Collins, R-Maine, arrives in the Senate where she has said she will vote for a resolution to annul President Donald Trump's declaration of a national emergency at the southwest border, on Capitol Hill in Washington, Thursday, March 14, 2019. (AP Photo/J. Scott Applewhite)
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WASHINGTON (AP) — In a stunning rebuke, a dozen defecting Republicans joined Senate Democrats Thursday to block the national emergency that President Donald Trump declared so he could build his border wall with Mexico.