Trump expected to remove DHS head, may replace chief of staff: source

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. (Reporting by Steve Holland; writing by Makini Brice; editing by David Alexander)