US President Bill Clinton was served by a total of only two secretaries of state during his entire eight years in the White House. Mr George W. Bush, who succeeded him, also had only two secretaries of state during his eight-year stint as America's chief executive. And so did Mr Barack Obama. But President Donald Trump has already had two secretaries of state within his first year in the Oval Office.
To many, this basic fact alone is frequently offered as proof of Mr Trump's chaotic conduct of foreign policy, and his fickle disregard for people, established procedures and normal diplomatic norms.