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The firing of Defense Secretary Mark Esper was the beginning of a series of changes to top-level positions at the Pentagon.
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Secretary Esper has kept a letter of resignation on hand since the summer, when he and the president disagreed over the use of active duty troops to put down street protests.
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The FBI director and other national security officials are scheduled to appear on Thursday morning to talk about threats to the U.S., but the director of national intelligence isn't expected.