Erica Roach, the chief financial officer of the US Office of Personnel Management, resigned this week amid swift changes to the federal workforce.

The Office of Personnel Management’s chief financial officer, who manages more than $1 trillion in funds, was pushed out this week, two sources with knowledge of the situation told CNN.

President Donald Trump is relying on a relatively obscure federal agency to reshape government. The Office of Personnel Management was created in 1979 by President Jimmy Carter and is the equivalent of the government's human resources departent.