WASHINGTON — Secretary of State Marco Rubio unveiled a massive overhaul of the State Department on Tuesday, with plans to reduce staff in the U.S. by 15% while closing and consolidating more than 100 bureaus worldwide as part of the Trump administration's “America First” mandate.

Marco Rubio is closing offices tasked with advancing American values around the world as part of a sweeping overhaul of the State Department. The Secretary of State said the reorganization was because the U.