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WASHINGTON, Aug 28 (Reuters) - U.S. Republican presidential nominee Donald Trump tweeted on Sunday night that he would make a major speech on illegal immigration in Arizona on Wednesday.

Trump said on Saturday he would crack down on illegal immigrants who overstay their visas as he sought to clarify his views on how to overhaul the U.S. immigration system after saying earlier in the week that he was softening on his plan to deport all 11 million illegal immigrants. (Reporting by Peter Cooney; Editing by Bill Trott)

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