In a letter to Mr. Tillerson last week, Democratic members of the House Foreign Relations Committee, citing what they said was “the exodus of more than 100 senior Foreign Service officers from the State Department since January,” expressed concern about “what appears to be the intentional hollowing-out of our senior diplomatic ranks.”

Senator John McCain, Republican of Arizona, and Senator Jeanne Shaheen, Democrat of New Hampshire, sent a similar letter, telling Mr. Tillerson that “America’s diplomatic power is being weakened internally as complex global crises are growing externally.”

Mr. Tillerson has frozen most hiring and recently offered a $25,000 buyout in hopes of pushing nearly 2,000 career diplomats and civil servants to leave by October 2018.

His small cadre of aides have fired some diplomats and gotten others to resign by refusing them the assignments they wanted or taking away their duties altogether. Among those fired or sidelined were most of the top African-American and Latino diplomats, as well as many women, difficult losses in a department that has long struggled with diversity.

Interesting how they purge people, leave positions open and ignored yet try to appoint the new head of consumer proactive, which is illegal.