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In page Dwight D. Eisenhower:
"Since the 19th century, many if not all presidents were assisted by a central figure or "gatekeeper", sometimes described as the president's private secretary, sometimes with no official title.[5] Eisenhower formalized this role, introducing the office of White House Chief of Staff – an idea he borrowed from the United States Army. Every president after Lyndon Johnson has appointed staff to this position.[citation needed]
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