WASHINGTON — The Trump administration said Tuesday that it is pulling almost all U.S. Agency for International Development workers off the job and out of the field worldwide, moving to all but end a six-decade mission to shore up American security by fighting starvation, funding education and working to end epidemics.

Dozens of senior officials put on leave. Thousands of contractors laid off. A freeze put on billions of dollars in humanitarian assistance to other countries. Over the last two weeks, President Donald Trump's administration has made significant changes to the U.