This is how long the hiring freeze will last and the implications for federal employees, those with job offers and college graduates and students.

President Trump’s directive is supposed to exempt national security and public safety positions, but the F.B.I. has put an immediate hiring freeze in place.

The Smithsonian Institution is closing its diversity office and freezing all federal hiring. The decision will affect dozens of American museums, research centers and libraries, as well as the National Zoo.