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WASHINGTON (Reuters) - U.S. President Donald Trump is expected to remove U.S. Department of Homeland Security Secretary Kirstjen Nielsen and is considering replacing his chief of staff, John Kelly, a source close to the White House said on Tuesday.

Trump has grown weary of Nielsen during his push to tighten the U.S. border with Mexico. “It’s been frayed for a long time,” the source said, cautioning Trump could again change his mind on the matter.