WASHINGTON—Immigration and Customs Enforcement will launch an effort to round up thousands of undocumented migrants across the country on Sunday as part of the Trump administration’s crackdown on illegal immigration, according to three administration officials. Details of this weekend’s operations remain unknown, but the officials said that the orders include detention and deportations. One of the officials said ICE has been ordered to go after people “who received a final order of deportation from an immigration judge after…

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