“Trump’s Cabinet turnover at 30 months has exceeded his five predecessors’ after an entire first term in office,” said Kathryn Dunn Tenpas, who oversees the Brookings data. “It is exceptional.”

Chris Lu, a former White House official under President Barack Obama who managed the Cabinet, said the situation “dispels this idea that Trump — who came in without any experience in government and who ran on the theory of being [a] businessman — could run things better. Clearly, this is not the case.”

The turnover takes a toll on policy decisions Trump is trying to enact, say former and current U.S. officials.

“There are just a couple of agencies where the president has a keen interest in policy including at DHS. But leading that agency really is one of the most difficult jobs in government, and it is near impossible to produce the results the president wants,” said one senior administration official.