The firing of Defense Secretary Mark Esper kicked off a rapid-fire series of high-level departures at the Pentagon on Tuesday, setting off alarms on Capitol Hill that the White House was installing loyalists to carry out President Donald Trump’s wishes during an already tense transition.

In quick succession, top officials overseeing policy, intelligence and the defense secretary’s staff all had resigned by the end of the day Tuesday, replaced by political operatives who are fiercely loyal to Trump and have trafficked in “deep state” conspiracy theories.