The State Department began firing more than 1,350 U.S.-based employees on Friday as the administration of President Donald Trump presses ahead with an unprecedented overhaul of its diplomatic corps, a move critics say will undermine U.S. ability to defend and promote U.S. interests abroad, Reuters reported.

The layoffs, which affect 1,107 civil service and 246 foreign service officers based in the United States, come at a time when Washington is grappling with multiple crises on the world stage: Russia's war in Ukraine, the almost two-year-long Gaza conflict, and the Middle East on edge due to high tension between Israel and Iran.

"The Department is streamlining domestic operations to focus on diplomatic priorities," an internal State Department notice that was sent to the workforce said. "Headcount reductions have been carefully tailored to affect non-core functions, duplicative or redundant offices, and offices where considerable efficiencies may be found," it added.

The total reduction in the workforce will be nearly 3,000, including the voluntary departures, according to the notice and a senior State Department official, out of the 18,000 employees based in the United States.